[lldb][test] Modernize asserts (#82503)

This uses [teyit](https://pypi.org/project/teyit/) to modernize asserts,
as recommended by the [unittest release
notes](https://docs.python.org/3.12/whatsne

[lldb][test] Modernize asserts (#82503)

This uses [teyit](https://pypi.org/project/teyit/) to modernize asserts,
as recommended by the [unittest release
notes](https://docs.python.org/3.12/whatsnew/3.12.html#id3).

For example, `assertTrue(a == b)` is replaced with `assertEqual(a, b)`.
This produces better error messages, e.g. `error: unexpectedly found 1
and 2 to be different` instead of `error: False`.

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[NFC][Py Reformat] Reformat python files in lldb

This is an ongoing series of commits that are reformatting our Python
code. Reformatting is done with `black` (23.1.0).

If you end up having problem

[NFC][Py Reformat] Reformat python files in lldb

This is an ongoing series of commits that are reformatting our Python
code. Reformatting is done with `black` (23.1.0).

If you end up having problems merging this commit because you have made
changes to a python file, the best way to handle that is to run `git
checkout --ours <yourfile>` and then reformat it with black.

RFC: https://discourse.llvm.org/t/rfc-document-and-standardize-python-code-style

Differential revision: https://reviews.llvm.org/D151460

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[lldb][CPlusPlus] Add abi_tag support to the CPlusPlusNameParser

This patch teaches the `CPlusPlusNameParser` to parse the
demangled/prettified [[gnu::abi_tag(...)]] attribute. The demangled format

[lldb][CPlusPlus] Add abi_tag support to the CPlusPlusNameParser

This patch teaches the `CPlusPlusNameParser` to parse the
demangled/prettified [[gnu::abi_tag(...)]] attribute. The demangled format
isn't standardized and the additions to the parser were mainly driven
using Clang (and the limited information on this from the official
Clang docs).

This change is motivated by multiple failures around step-in
behaviour for libcxx APIs (many of which have ABI tags as of recently).
LLDB determines whether the `step-avoid-regexp` matches the current
frame by parsing the scope-qualified name out of the demangled
function symbol. On failure, the `CPlusPlusNameParser` will simply
return the fully demangled name (which can include the return type)
to the caller, which in `FrameMatchesAvoidCriteria` means we will
not correctly decide whether we should stop at a frame or not if
the function has an abi_tag.

Ideally we wouldn't want to rely on the non-standard format
of demangled attributes. Alternatives would be:

1. Use the mangle tree API to do the parsing for us
2. Reconstruct the scope-qualified name from DWARF instead of parsing
the demangled name

(1) isn't feasible without a significant refactor of `lldb_private::Mangled`,
if we want to do this efficiently.

(2) could be feasible in cases where debug-info for a frame is
available. But it does mean we certain operations (such as step-in regexp,
and frame function names) won't work with/won't show ABI tags.

**Testing**

* Un-XFAILed step-in API test
* Added parser unit-tests

Differential Revision: https://reviews.llvm.org/D136306

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[lldb-tests] Add libcxx version check for regex tests

Regex requires the c++20 flag, which was not introduced available prior
to Clang 11.

Differential Revision: https://reviews.llvm.org/D136165

[lldb][test] Skip TestStepAvoidsRegexp.py on Windows

[lldb][CPlusPlusLanguage] Respect the step-avoid-regex for functions with auto return types

**Summary**

The primary motivation for this patch is to make sure we handle
the step-in behaviour for fun

[lldb][CPlusPlusLanguage] Respect the step-avoid-regex for functions with auto return types

**Summary**

The primary motivation for this patch is to make sure we handle
the step-in behaviour for functions in the `std` namespace which
have an `auto` return type. Currently the default `step-avoid-regex`
setting is `^std::` but LLDB will still step into template functions
with `auto` return types in the `std` namespace.

**Details**
When we hit a breakpoint and check whether we should stop, we call
into `ThreadPlanStepInRange::FrameMatchesAvoidCriteria`. We then ask
for the frame function name via `SymbolContext::GetFunctionName(Mangled::ePreferDemangledWithoutArguments)`.
This ends up trying to parse the function name using `CPlusPlusLanguage::MethodName::GetBasename` which
parses the raw demangled name string.

`CPlusPlusNameParser::ParseFunctionImpl` calls `ConsumeTypename` to skip
the (in our case auto) return type of the demangled name (according to the
Itanium ABI this is a valid thing to encode into the mangled name). However,
`ConsumeTypename` doesn't strip out a plain `auto` identifier
(it will strip a `decltype(auto) return type though). So we are now left with
a basename that still has the return type in it, thus failing to match the `^std::`
regex.

Example frame where the return type is still part of the function name:
```
Process 1234 stopped
* thread #1, stop reason = step in
frame #0: 0x12345678 repro`auto std::test_return_auto<int>() at main.cpp:12:5
9
10 template <class>
11 auto test_return_auto() {
-> 12 return 42;
13 }
```

This is another case where the `CPlusPlusNameParser` breaks us in subtle ways
due to evolving C++ syntax. There are longer-term plans of replacing the hand-rolled
C++ parser with an alternative that uses the mangle tree API to do the parsing for us.

**Testing**

* Added API and unit-tests
* Adding support for ABI tags into the parser is a larger undertaking
which we would rather solve properly by using libcxxabi's mangle tree
parser

Differential Revision: https://reviews.llvm.org/D135413

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