other: Make the battery dependency/features optional

[ClementTsang]

Description

A description of the change and what it does. If relevant (such as any change that modifies the UI), please provide screenshots of the change:

Allows disabling of the battery dependency through a feature flag. This also aims to disable all related features.

Issue

If applicable, what issue does this address?

Partially solves: #569

Testing

If relevant, please state how this was tested. All changes must be tested to work:

Furthermore, mark which platforms this change was tested on. All platforms directly affected by the change must be tested

• Windows
• macOS
• Linux

Checklist

If relevant, ensure the following have been met:

• Areas your change affects have been linted using rustfmt (cargo fmt)
• The change has been tested and doesn't appear to cause any unintended breakage
• Documentation has been added/updated if needed (README.md, help menu, etc.)
• The pull request passes the provided CI pipeline
• There are no merge conflicts