Refactor internal

[nazar-pc]

The goal of this PR is to simplify things by replacing internal data structure that has several IDs, unique for different use cases, with one handlerId that can be looked up in a global map instead.

In order to do that, every entity in the worker now implements Channel::ChannelSocket::RequestHandler if it handles Channel requests, PayloadChannel::PayloadChannelSocket::RequestHandler if it handles PayloadChannel requests and PayloadChannel::PayloadChannelSocket::NotificationHandler if it supports notifications. With that we can store them in 3 global maps and look up by handleId in one step instead of traversing down into nested structure.

While this simplifies handling somewhat, it is even more beneficial for re-implementing #870 on top since we will no longer need to worry about a list of IDs that can belong to anything, we'll always have exactly one ID to deal with at a time.

Reviewing commits separately is recommended.

[ibc]

Still not completely reviewed, just some comments added. Another one here: shouldn't we add proper TS type to internal object received by JS instances such as Consumer?

[nazar-pc]

Another one here: shouldn't we add proper TS type to internal object received by JS instances such as Consumer?

Potentially, but nothing has changed in that regard, internal field in classes is the same as before, it just isn't sent in full to worker anymore. I think we can do that separately if you'd like.

[ibc]

Can this be merged so I'll adapt pending work of Jose in a new PR?

[MatanYemini]

prod.id 66d90c9f-3792-412c-b566-c861c7d0d1f7 error Error: Channel request handler with ID 66d90c9f-3792-412c-b566-c861c7d0d1f7 already exists [method:transport.produce]","time":"2022-10-15T13:51:02.831Z","v":0}

I am getting this error constantly after these changes.

Seems to happen once I subscribe "too fast", if I wait 5-10s, seems to work. (after I was told that it is available)

Will provide more details..

[nazar-pc]

@MatanYemini make sure to not pipe producers within the same worker to avoid that error. If you have further comments please create a thread on the forum: https://mediasoup.discourse.group/