Session navigation scanner toast api examples for pos ui ext docs

This PR adds the examples for navigation, session, scanner, toast apis to the docs.

Some important changes you can look below at the comments to find more information but

I added a extension target helper
You can edit the required field for docs to help us clarify which targets are needed for usage
Updating the formatter file to allow us to have consistent styling for ts and tsx files

Shopify / ui-extensions