chore: Update ESPP to 1.0 and LVGL to 9.2.2. Remove submodules

[finger563]

Description

• feat: Update ESPP / LVGL
• remove unused variable
• add dep lock
• update workflows
• replace use of recolor (not supported in 9.2.2) with spans where possible
• update graph to support configurable number of points
• update graph to better style / configure legend and display
• update graph to use new span for y axis

Motivation and Context

Keeps this repo up to date and brings in new features and performance improvements.

How has this been tested?

Build and run main on T-Deck hardware and use various test scripts to ensure it still receives data and displays it properly.

Note: text recoloring was removed in LVGL v9, even up to v9.2.2, but will be added back in the upcoming v9.3.0 release.

lvgl/lvgl#6966 (comment)

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! ✅