Add dedicated signal message for chat + transcriptions

[lukasIO]

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Latest commit: 81b2f52

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The package or glob expression "github.com/livekit/protocol" specified in the `fixed` option does not match any package in the project. You may have misspelled the package name or provided an invalid glob expression. Note that glob expressions must be defined according to https://www.npmjs.com/package/micromatch.

[bcherry]

@lukasIO shall we close this?