[video] Add `keepScreenOnWhilePlaying` property

[behenate]

Why

Currently on iOS the player will keep the screen on while a video is playing, on Android playing a video has no effect on screen going to sleep. This PR unifies the behavior and adds a new property: keepScreenOnWhilePlaying to allow users to control this feature.

How

Added keepScreenOnWhilePlaying, enabled it by default on Android. Also the fullscreen player on Android will always stay on.

Test Plan

Tested in BareExpo on physical Android and iOS devices.

[github-actions[bot]]

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File Patterns	Mentions
docs/**	@amandeepmittal
packages/expo-video/**	@lukmccall, @aleqsio

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[expo-bot]

The Pull Request introduced fingerprint changes against the base commit: 85df98e3bc6ae15787a2ce2d4502421d0e9d7a7f

Fingerprint diff

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