Meterpreter Extension Base IDs

[smcintyre-r7]

Each Meterpreter defines it's own TLVs and each should be namespaced into their dedicated ranges. The sniffer and extapi extensions are both currently set to 0 which can create conflicts when determining the TLV types based on their numeric value.

The Python, Sniffer and Extapi extensions should be updated to have a unique extension base and their types should all take that into account. This is marked as a breaking change because it would alter the IDs that are used for communication between Metasploit and the Meterpreter instance.

[smcintyre-r7]

The railgun types should also be updated to use the STDAPI extension base.

[adfoster-r7]

Cross-referencing the initial issue that spawned this discussion #16258 (comment)

[github-actions]

Hi!

This issue has been left open with no activity for a while now.

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