feat(plugins): Create concurrency pytest plugin

[marioevz]

🗒️ Description

Creates a new plugin that facilitates concurrency in all test-related commands such as fill, consume and execute.

Before the plugin, all different plugins created its own temporary folder in order to save information that was meant to be share across different xdist processes (e.g. the execution client running the tests in consume, or in execute hive), and it relied on each plugin having the temporary folder being passed by the command caller for all instances to coincide on the same folder name.

Now the concurrency plugin uses testrun_uid to generate a deterministic temporary folder that will be the same across processes, and can be used for coordination.

🔗 Related Issues

Functionality initially added in #712.

✅ Checklist

• All: Set appropriate labels for the changes.
• All: Considered squashing commits to improve commit history.
• All: Added an entry to CHANGELOG.md.
• All: Considered updating the online docs in the ./docs/ directory.
• Tests: All converted JSON/YML tests from ethereum/tests have been added to converted-ethereum-tests.txt.
• Tests: A PR with removal of converted JSON/YML tests from ethereum/tests have been opened.
• Tests: Included the type and version of evm t8n tool used to locally execute test cases: e.g., ref with commit hash or geth 1.13.1-stable-3f40e65.
• Tests: Ran mkdocs serve locally and verified the auto-generated docs for new tests in the Test Case Reference are correctly formatted.

[danceratopz]

Really nice abstraction. So nice to get this out of the cli and abstracted to this plugin.

LGTM, just a few minor comments, mainly help/docstrings below.

[marioevz]

@danceratopz awesome suggestions, thanks for the review, I'll merge in a bit :)