Add 802.11 Radio Measurement action support

[middleendian]

Dot11 Radio Measurement Action

Scope:

• Adds Dot11RadioMeasurement for Action category 5.
• Adds Radio Measurement Request and Report action bodies for actions 0
  and 1.
• Specializes Beacon measurement request/report fields for Measurement Type
  5.
• Leaves unsupported measurement types as raw
  measurement_request_data / measurement_report_data.
• Adds focused dissection and raw round-trip tests for Beacon request,
  Beacon report, and unsupported measurement request fallback.

Spec references used in code comments:

• IEEE Std 802.11-2020, 9.6.6.1: Radio Measurement Action field values.
• IEEE Std 802.11-2020, 9.6.6.2: Radio Measurement Request frame.
• IEEE Std 802.11-2020, 9.6.6.3: Radio Measurement Report frame.
• IEEE Std 802.11-2020, 9.4.2.20: Measurement Request element.
• IEEE Std 802.11-2020, 9.4.2.20.7: Beacon request.
• IEEE Std 802.11-2020, 9.4.2.21: Measurement Report element.
• IEEE Std 802.11-2020, 9.4.2.21.7: Beacon report.

Intentional partial support:

• Only Beacon measurement type 5 is specialized in this PR.
• Other measurement types are retained as raw bytes instead of being parsed
  with the wrong field layout.
• The frame bodies parse one Measurement Request/Report element.

Test command used:

test/run_tests -t test/scapy/layers/dot11.uts -F

Result:

PASSED=68 FAILED=0

AI-Assisted: yes (Codex)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.22%. Comparing base (2498fbb) to head (94e7777).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5039      +/-   ##
==========================================
- Coverage   80.22%   80.22%   -0.01%     
==========================================
  Files         387      387              
  Lines       96450    96473      +23     
==========================================
+ Hits        77381    77395      +14     
- Misses      19069    19078       +9     

Files with missing lines	Coverage Δ
scapy/layers/dot11.py	92.17% <100.00%> (+0.27%)	⬆️

... and 8 files with indirect coverage changes

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