Add 802.11 EHT Operation element support

[middleendian]

Add Dot11 EHT Operation Element

Scope:

• Adds Dot11EltEHTOperation for Element ID Extension 106.
• Adds Dot11EHTOperationInfo for the optional EHT Operation Information
  field.
• Parses the fixed EHT Operation Parameters byte, Basic EHT-MCS and NSS Set,
  optional EHT Operation Information, and optional Disabled Subchannel Bitmap.
• Adds focused dissection and raw round-trip tests for EHT Operation with no
  Operation Information, with Operation Information, and with Disabled
  Subchannel Bitmap followed by another information element.

Spec references used in code comments:

• IEEE P802.11be/D7.0, 9.4.2.311: EHT Operation element.

Intentional partial support:

• This patch does not attempt to parse every EHT-related element or every
  future draft extension.
• Unknown or unsupported EHT information remains outside this focused parser
  instead of being guessed from incomplete structure.

Test command used:

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

Result:

PASSED=73 FAILED=0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.23%. Comparing base (326cf5e) to head (74eaf0c).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5053      +/-   ##
==========================================
- Coverage   80.23%   80.23%   -0.01%     
==========================================
  Files         388      388              
  Lines       96517    96529      +12     
==========================================
+ Hits        77442    77450       +8     
- Misses      19075    19079       +4     

Files with missing lines	Coverage Δ
scapy/layers/dot11.py	92.30% <100.00%> (+0.13%)	⬆️

... and 2 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.