Investigate hypermedia in MockMVC testing

[checketts]

HTMX's support for hypermedia client means that we could write tests that validate those calls.

I wonder if we could add test support that would inspect a response, locate an hx-get request, then make a new MockMVC call that can be further verified.

• Would need to create a 'testing' library
• Determine what syntax would make sense
• Is this concept even useful?

This isn't urgent. But the idea seems really promising. Any investigation can just take place in this project's src/test to determine if it is useful.