`defmt-test-macros`: Add `before_each` and `after_each` attributes.

[hdoordt]

Add before_each and after_each attributes to defmt-test-macros. These attributes define functions that are called before and after each test case respectively.

I use them myself to alter a pin state, signaling my power profiler whether an actual test is running, but this feature can be used in many other situations.

I have some doubt about (not completely, but mostly) duplicated code, but I'm not sure adding macros would make it any better. Any suggestions on cleaning that up are very welcome!

And of course, thanks to the Knurling team and all contributors for setting up a great set of crates!

[hdoordt]

I have no idea why my changelog entry is considered insufficient. Any help?

[Urhengulas]

@hdoordt said:

I have no idea why my changelog entry is considered insufficient. Any help?

The problem is that the CI expects you to change ./CHANGELOG.md, but you are, correctly, changing ./firmware/defmt-test/CHANGELOG.md.

[Urhengulas]

Sorry for the delay. I was busy and didn't get around to take a second look at the PR. Thank you for your work!

bors r+

[hdoordt]

@Urhengulas thanks for having a look!

[bors[bot]]

Build succeeded:

• ci