Autosave settings after settings value are changed

[zeroliu]

Is your feature request related to a problem? Please describe.
Users must click "save and reload" after changing the settings, which is easy to forget. Most obsidian settings are autosaved after each change.

Describe the solution you'd like
Make copilot settings autosave.

Describe alternatives you've considered
Warn users when unsaved changes are detected. But autosave is more intuitive.

Additional context
I discussed this offline with @logancyang. A few modules need to be reset when a value changes. I need to verify that they work as intended and pick up the new settings after the change.

[zeroliu]

I can take a stab