Add IEEE 80211 definitions.

[abeltrano]

Type

• Bug fix
• Feature addition
• Feature update
• Documentation
• Build Infrastructure

Side Effects

• Breaking change
• Non-functional change

Goals

• Allow use of IEEE 802.11 concepts in an OS-agnostic way.

Technical Details

• Introduce enumerations for supported frequency bands, high-level protocols (eg. 802.11 a/b/g/n/...), authentication methods, and cipher algorithms.
• Add user-defined literals _MHz and _GHz to allow easier use of IeeeFrequencyBand constants.

Test Results

• All unit tests pass.

Reviewer Focus

• None

Future Work

• Add other IEEE 802.11 definitions for radio capabilities as needed for existing APIs.

Checklist

• Build target all compiles cleanly.
• clang-format and clang-tidy deltas produced no new output.
• Newly added functions include doxygen-style comment block.