WearOS: Option for adding an 'Assist' shortcut to Shortcut-Tiles

**Is your feature request related to a problem? Please describe.**

Currently the Assist feature on WearOS can be launched through complications, through the app menu, or by its own Assist-Tile. However as I'd like to have all my home assistant related entries on a single page, it'd be nice to have a shortcut for Assist added to the Shortcuts-Tile.

**Describe the solution you'd like**

Add the option to not just add entities to the shortcuts tile, but also a shortcut to the Assist intent (and perhaps also a shortcut to the main HA wear app itself). This way a user does not have to swipe to a different page to get access to this feature.

**Describe alternatives you've considered, if any**

**Additional context**

Happy to take a look at implementing this myself, if you're open to merging a PR for such a feature.