Logging to file with status and parallel recordings option

[DaniilVdovinov]

New features

Logging to file

Creates a log file of the recording process in recordings folder. Changes the file extension depending on the recording stage.

• MEETING_ID.start - the recording process has started and is working
• MEETING_ID.error - an error occurred while recording
• MEETING_ID.done - recording completed successfully

Using this logging file, you can track the status of recording.

Parallel recordings

Added flag to disable parallel recording - disableAsyncRecordings

You can disable parallel recording by edit this flag in bbb-mp4.js file (default enabled). The process will wait for the other records to finish. After that, a random record from the waiting ones will start.

This can help with load balancing when recording many mp4 files.

[arun-hel]

@DaniilVdovinov We will check this PR.