net/mlx5: introduce tracepoints

There is an intention to engage DPDK tracing capabilities
for mlx5 PMDs monitoring and profiling in various modes.
The patch introduces tracepoints for the Tx datapat

net/mlx5: introduce tracepoints

There is an intention to engage DPDK tracing capabilities
for mlx5 PMDs monitoring and profiling in various modes.
The patch introduces tracepoints for the Tx datapath in
the ethernet device driver.

To engage this tracing capability the following steps
should be taken:

- meson option -Denable_trace_fp=true
- meson option -Dc_args='-DALLOW_EXPERIMENTAL_API'
- EAL command line parameter --trace=pmd.net.mlx5.tx.*

The Tx datapath tracing allows to get information how packets
are pushed into hardware descriptors, time stamping for
scheduled wait and send completions, etc.

To provide the human readable form of trace results the
dedicated post-processing script is presumed.

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>

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