[libc++][NFC] Add missing license headers

Also standardize the license comment in several files where it was
different from what we normally do.

[libc++] Granularize <ostream> (#85537)

This also includes `<__ostream/basic_ostream.h>` in `<sstream>` now,
reducing the include time of `<complex>` from 819ms to 603ms.

[libc++][test] Don't include `test_format_context.h` in `parse.pass.cpp` (#83734)

The `parse.pass.cpp` tests doen't need to call
`test_format_context_create` to create a `basic_format_context`, so

[libc++][test] Don't include `test_format_context.h` in `parse.pass.cpp` (#83734)

The `parse.pass.cpp` tests doen't need to call
`test_format_context_create` to create a `basic_format_context`, so they
shouldn't include `test_format_context.h`.

The `to_address` mechanism works around the iterator debugging
mechanisms of MSVC STL. Related to
[LWG3989](https://cplusplus.github.io/LWG/issue3989).

Discovered when implementing `formatter<tuple>` in MSVC STL. With the
inclusion removed, `std/utilities/format/format.tuple/parse.pass.cpp`
when using enhanced MSVC STL (and `/utf-8` option for MSVC).

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[libc++] Mark slow tests as unsupported on GCC

Some tests in our test suite are unbelievably slow on GCC due to the
use of the always_inline attribute. See [1] for more details.

This patch introduc

[libc++] Mark slow tests as unsupported on GCC

Some tests in our test suite are unbelievably slow on GCC due to the
use of the always_inline attribute. See [1] for more details.

This patch introduces the GCC-ALWAYS_INLINE-FIXME lit feature to
disable tests that are plagued by that issue. At the same time, it
moves several existing tests from ad-hoc `UNSUPPORTED: gcc-12` markup
to the new GCC-ALWAYS_INLINE-FIXME feature, and marks the slowest tests
reported by the CI as `UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME`.

[1]: https://discourse.llvm.org/t/rfc-stop-supporting-extern-instantiations-with-gcc/71277/1

Differential Revision: https://reviews.llvm.org/D152736

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[libc++][format] Removes the experimental status.

The code has been quite ready for a while now and there are no more ABI
breaking papers. So this is a good time to mark the feature as stable.

Revi

[libc++][format] Removes the experimental status.

The code has been quite ready for a while now and there are no more ABI
breaking papers. So this is a good time to mark the feature as stable.

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D150802

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[libc++][format] Improves tests.

This is based on the last open review comment in D144331 and is applied
to all occurrences.

Reviewed By: ldionne, #libc

Differential Revision: https://reviews.llvm

[libc++][format] Improves tests.

This is based on the last open review comment in D144331 and is applied
to all occurrences.

Reviewed By: ldionne, #libc

Differential Revision: https://reviews.llvm.org/D147885

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[libc++][format] Implements formatter thread::id.

Since stacktrace header is WIP and it's not sure that will be done
before LLVM17 update the documentation. When the header is implemented
implementi

[libc++][format] Implements formatter thread::id.

Since stacktrace header is WIP and it's not sure that will be done
before LLVM17 update the documentation. When the header is implemented
implementing the formatter is trivial, so that can be done quickly
afterwards.

Implements parts of:
- P2693R1 Formatting thread::id and stacktrace

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D144331

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