Add support for S1G beacon to dot11

[rkinder2023]

Brief description

S1G beacon is unsupported currently, this diff adds support + unit test.

Scapy version

7dcb5fea8f40728969dd373aefc999da1a687040

Python version

3.12.2

Operating system

MacOS Sonoma 14.4

Additional environment information

No response

How to reproduce

New feature - support S1G beacon.

Actual result

No response

Expected result

No response

Related resources

No response