Feature Request: Signal Ending of a Live Session

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**What's the problem? (required)**
Currently, there is a hard-coded 5min timeout window for sessions. This means if a session is stopped, the user needs to wait for 5 mins before starting another session, otherwise the "new session" is considered a continuation of the previous session.

**What's the current behavior? (required)**
Have a way for the application to signal the ending of a session. Mux does it [this way](https://docs.mux.com/api-reference/video#operation/signal-live-stream-complete). This should have the side effect of making the recording available immediately.

**Describe a possible solution you've considered (optional)**
An alternative would be allowing the API user to specify the timeout window. But this doesn't directly address the issue of when an user wants to start a new session right after finishing the previous session.

No files, tests, or entry points are identified. Start by locating the session and recording API behavior around the hard-coded five-minute timeout, then compare the desired signal with Mux's live-stream-complete behavior. Done means an application can explicitly end a session and its recording becomes available immediately, without waiting for the timeout.

Written by the indexing model from the issue text.