refactor: trace decoder tests

[0xaatif]

It was very difficult to see which test was failing and why in #583.

I've rewritten the integration tests to be more succint, simpler, test more things, and have a better ux:

• Use assert2 to make multiple assertions at once, with more informative output on assertion failure.
• Use libtest_mimic to create test cases for each input file. Test selection, failure attribution all work as expected.
• Move the test cases for trace_decoder::wire into trace_decoder/src - they are completely unrelated to the tests in trace_decoder/tests.
• Made the directories clearer and less nested.
• Documented test cases and test binaries where possible.
• Cover batch sizes of 3 AND 1

Here's the new UX for a failing test with multiple conditions tripping:

And for passing tests:

$ cargo test --quiet --release --package trace_decoder --test simulate-execution
loading test vectors...done

running 176 tests
test b19840104_main/0  ... ok
test b19840104_main/1  ... ok
test b20240052_main/9  ... ok
...
test b20240058_main/27 ... ok

test result: ok. 176 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 50.59s

Note the simulate-execution test needs --quiet because of this noise (#597)