Support keeping screen awake

[Keith-CY]

This issue comes from #309

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Issue #309 usually happens when the screen is locked/computer sleeps. And synchronization stops when the screen is locked/computer is sleeping.

There's an API to keep the computer awake: https://developer.mozilla.org/en-US/docs/Web/API/Screen_Wake_Lock_API. By enabling it, the synchronization won't be broken anymore.

[Danie0918]

【Support keeping screen awake】

• Requirement Description: Support keeping the screen awake during synchronization.

• Requirement Contents

Add keep the screen awake option to Settings. (Disable by default)

[Keith-CY]

1. When the synchronization time is greater than 15 minutes, a pop-up window indicates whether the user needs to keep the screen awake. (The default option is to turn on keep the screen awake)

I think it should be false by default because it may require some permission from the system. This feature can be highlighted in the release note, but it should be enabled by users' willingness.

[Kirl70]

Design Draft:
https://www.figma.com/file/6XNoimRDbFTTNm016rbIdU/Magickbase?type=design&node-id=32457%3A32234&mode=design&t=SrNnL97ARpTRla4j-1

[yanguoyu]

nervosnetwork/neuron#3066

[silySuper]

verfied