feat: keep screen awake during active oscilloscope usage

[rahul31124]

Fixes #3013

Changes

• Integrated wakelock_plus into the Oscilloscope state provider.
• The screen now remains ON during active measurements (including XY plot and playback).
• The wakelock is automatically released when no measurement is running or when playback is paused/stopped.

Screenshots / Recordings

N/A

Checklist:

• No hard coding: I have used values from constants.dart or localization files instead of hard-coded values.
• No end of file edits: No modifications done at end of resource files.
• Code reformatting: I have formatted the code using dart format or the IDE formatter.
• Code analysis: My code passes checks run in flutter analyze and tests run in flutter test.

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[rahul31124]

Hello @marcnause,
I have added wakelock_plus so that the oscilloscope screen remains awake during active usage (live measurement, XY plot, and playback).
I’m unable to share a screen recording since the screen automatically stays awake during recording, but the behavior has been tested and works as expected.