arbitrary settings

Feature description
Add a cmd to get/set arbitrary settings from arbitrary categories, similarly to adb shell settings (but without ADB privilege)

This will make Termux much more useful, and less dependent on automation apps.

Reference implementation

Have you checked if the feature is accessible through the Android API? Obviously, yes.
Do you know of other open-source apps that has a similar feature as the one you want? (Provide links)

• https://llamalab.com/automate/doc/block/system_setting_get.html
• https://llamalab.com/automate/doc/block/system_setting_set.html

etc
An alternative implementation is to "overload" the settings command in the same way that am is "overloaded", but this would no longer be part of termux-api, it would have to be included in termux-app

Start by comparing the requested behavior with Android's settings API and the linked Automate get/set references. Review the existing termux-api command structure and the mentioned termux-app settings/am approach, then determine where the feature belongs. Done means arbitrary settings categories can be read and changed without ADB privilege, with the package boundary decided.