Add an increment example which can be paused by a dependency

[leighmcculloch]

What

Add an increment example which can be paused by a dependency

Why

For use in examples I'm working on for a blog post and how-to guides on testing.

Testing with dependencies is a topic that needs covering, and a dependency that controls whether a contract is paused is a simple way to introduce a dependency without needing to focus on the dependencies logic and behavior too much.

[ElliotFriend]

I'm not sure i'm totally qualified to review all of this PR lol. It looks good from what i can tell, though. Follows the testing guides you've written nicely. Thanks a bunch!!

[tomerweller]

I disabled status checks on main in order to merge this PR and then re-enabled them. The docs linking to this example have already been merged so the docs were effectively broken. PTAL at the errors when you're back online @leighmcculloch @ElliotFriend