Adding feature_flags field to sip requests

[alexlivekit]

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[dennwc]

It should be on GetTrunkAuth, otherwise it might be too late for some features. Or we could put it in both.

[alexlivekit]

hm.. I can add it there as well, but the code isn't ready for that quite yet. I'll do that now though.

[nishadmusthafa]

Thinking about it more @alexlivekit , something like feature flags is usually tied to Auth/Accounts. So it makes sense to add it there. The other thing to note is we might use feature flags to decide things like when to send back the 100 trying, 180 which would happen before EvaluateSipDispatchRules.