Allow users to customize the stow configuration

[amalnanavati]

Describe this pull request. Link to relevant GitHub issues, if any.

This PR builds off of recent PRs (#136 , #135 , etc.) to allow users to customize the stow configuration.

Explain how this pull request was tested, including but not limited to the below checkmarks.

• Launch the code in real: python3 src/ada_feeding/start.py
• Ideally, sit in the wheelchair for all the below tests to ensure it feels safe.
• Verify Stow Position Settings work:
  • Regardless of what page you go to the Stow Position settings from, verify it moves to the stow position when you load it and moves back when you click "Done"
    • Bite Selection
    • Bite Acquisition Check
    • Detecting Face
    • Bite Done
  • Teleop it, verify the parameters in the YAML file update.
  • Click MoveAbovePlate. Verify it succeeds, and after that the teleop part is disabled.
  • Click Stow Arm, and verify the teleop part gets re-enabled. Verify it moves to the customized stow configuration.
  • Reset to default, verify that it updates the param file and immediately moves to the default stow configuration.
• Find reasonable stow configurations for each of the default side configurations.

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