Add the setter counter part of `Player.getMaxSeekToPreviousPosition()`

[MGaetan89]

Use case description

Currently, the Player interface provides a getMaxSeekToPreviousPosition() method, which returns a delay after which the player seeks to the previous item, instead of restarting the current item, when calling Player.seekToPrevious(). That delay is currently hardcoded to C.DEFAULT_MAX_SEEK_TO_PREVIOUS_POSITION_MS (3 seconds).
There is also a Player.Listener.onMaxSeekToPreviousPositionChanged(long) method, which is called when the delay changes. However, as far as we could see, there is currently no Player.setMaxSeekToPreviousPosition(long) method, allowing us to customise that delay.

Proposed solution

Provide a Player.setMaxSeekToPreviousPosition(long) method se the delay can be freely customised by developers.
If this request seems reasonable to you, I'm open to work on a PR to help integrate it in Media3.

Alternatives considered

Keep working with the current default delay.

[tonihei]

There is no particular not to have such a setter. Do you want to send a PR to add it to ExoPlayer.Builder (assuming you only want to set it once)? You can copy the pattern from setSeekBackIncrementMs.

[MGaetan89]

Yes, I can work on a PR for that

[MGaetan89]

I'm closing this, since #1437 has been merged.

Feel free to repoen if you prefer to close once it is released.

[tonihei]

Closing now is fine. Thanks again for the contribution!