feat(ui): add battery status indication

[finger563]

Description

• Update espp submodule to fix bug when unsubscribing from an event
• Update menu to properly unsubscribe the menu component instead of the gui component (copy paste error from long ago)
• Add battery header to box-emu-hal which includes the serialization component, adds a battery topic, and adds a BatteryInfo structure (the message data)
• Updated menu and gui to have battery status icons (battery level symbol, charge symbol) and battery status labels
• Updated menu and gui to subscribe to the battery topic and update their battery status displays when the event fires
• Updated main to send new battery info every second to test charge and discharge display in main gui and menu (until hardware V1 arrives with support for actual SoC / charge measurement

Motivation and Context

Closes #24

How has this been tested?

Building and running on V0 Hardware

Screenshots (if appropriate, e.g. schematic, board, console logs, lab pictures):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
• Hardware (schematic, board, system design) change
• Software change

Checklist:

• My change requires a change to the documentation.
• I have added / updated the documentation related to this change via either README or WIKI

Software

• I have added tests to cover my changes.
• I have updated the .github/workflows/build.yml file to add my new test to the automated cloud build github action.
• All new and existing tests passed.
• My code follows the code style of this project.

[github-actions]

✅Static analysis result - no issues found! ✅