Provide a possibility to pass metainfo by Hooks for SRT stream

[bcherniakh]

Describe the feature

Problem

Since v1.2.1 it is possible to use the MTX_QUERY env variable with hooks like runOnReady, runOnNotReady, etc. It is extremely convenient as this gives the possibility to add some token to query and recognize the stream originator in the API invoked by the hook or pass additional meta in that invocation. But this does not work for the SRT type of stream. The MTX_QUERY is empty for SRT. I believe that this might be so because of security reasons as the query for the SRT might contain login and password.

In my use case, I need to identify the user that initiated the stream in the hook and it would be really helpful if there was a possibility to pass either the query as an MTX_QUERY env var or SRT login.

** Possible solutions **

1. Add the new optional part for srtNewConnReq that can have the semantics of query and be used as query of pathAccessRequest
2. Pass the entire srtNewConnReq as the query to pathAccessRequest and env
3. Add the new env var that reflects credentials where applicable

I would gladly provide a PR for the acceptable solution

Thank you!

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