Sip to grpc error code mapping update

[alexlivekit]

The only things changed here, Ignoring automatic protoc version bump by GHA, are:

• protobufs/livekit_sip.proto : Added more SIP codes to enum.
• livekit/sip.go : Changed to explicit SIPStatusCode-to-codes.Code map.
• livekit/sip_test.go : Modified test to expect the updated status.

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[dennwc]

It's up to you, but we could potentially remove most of the 4xx mappings in favour of a default that we already have (it's InvalidArgument by default). Could probably keep the most frequent ones in the map and let everything else fall back to a default. But I don't mind if we keep the map as-is.

[alexlivekit]

I like there to be one source of "What does X turn to", and the fallback being a purely unexpected/unimplemented safety net. Easier to debug imo.