This commit centralizes all Android Intent constants into a new `MeshtasticIntent` object within the `core/api` module.
This refactoring makes the constants accessible to external applications and removes the duplicated definitions from the main application. The app and the service example have been updated to use these new centralized constants.
Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com>
