HLS S3 upload separate folders in Conferencing

[lastpeony]

With the default settings when continuous S3 upload is enabled for HLS and create a conference room all files for all participants are uploaded to the same folder.

Its required to have a subfolder for each participant.

[lastpeony]

We discussed this with @mekya and decided to implement a more dynamic solution, similar to the fileNameFormat app setting.

The subFolder setting will follow the structure below:

%m: Main track ID
%s: Stream ID
customStr: custom str
For example, if a user sets %m/%s as the subFolder format in the app settings, the .ts files should be organized in S3 like this:
streams/mainTrackId/streamId/1.ts

Another example:
subFolder:lastpeony/%m/%s
Result:
streams/lastpeony/mainTrackId/streamId/1.ts

This approach provides greater flexibility and consistency in file organization.