Use sys.remote_exec() to attach to pid, if available

[pdepetro]

Use PEP768 code injection on Python>=3.14.

Profiling shows that this is approximately 4x faster than pydevd's gdb injection:

======================================================================
RESULTS SUMMARY
======================================================================

sys.remote_exec (Python 3.14+ / PEP 768):
  Successful runs: 20/20
  Average time:    0.4589s
  Min time:        0.4178s
  Max time:        0.5595s

pydevd injection (--disable-sys-remote-exec):
  Successful runs: 20/20
  Average time:    2.0423s
  Min time:        1.9090s
  Max time:        2.5464s

----------------------------------------------------------------------
COMPARISON:
  sys.remote_exec is 4.45x faster than pydevd injection
  Time saved per attach: 1.5834s
----------------------------------------------------------------------

[pdepetro]

@microsoft-github-policy-service agree company="Meta"