feat: better annotation structure

[henryiii]

Closes #13

The annotation structure is redesigned to be more concise and clear, and to work with parametrized tests. The old structure repeated the code already visible in GHA, included the whole containing function, regardless of how long it was, and didn't tell you which invocation the error was from for parametrized tests.

The changes:

• The actual line number of the error is used
• The first line is the test is the run name, including any parametrization, class names, etc.
• Only the error explanation (can be multiline) is shown (without all the extra E's)

Here's an example of something before and after:

Before

After

Example run: before, after

Based on https://github.com/pytest-dev/pytest/blob/master/src/_pytest/terminal.py
Maybe this could be 0.1.0? :)

[utgwkk]

Implementation looks good to me, please fix tests.

[utgwkk]

Maybe this could be 0.1.0? :)

Yes, I want to release this feature with a new minor version!

[amezin]

Why is this PR switching from pytest_runtest_logreport to pytest_runtest_makereport? Not sure about rerunfailures #30 , but for another similar plugin - flaky - this change creates unnecessary annotations. pytest_runtest_logreport is called only once for a test: https://github.com/box/flaky/blob/master/flaky/flaky_pytest_plugin.py#L145-L149 but pytest_runtest_makereport is called for every rerun.