Replace file reading/writing with interprocess queues for tests

[MarkZH]

Type of pull request:

• Bug fix
• Feature
• Other

Description:

Instead of reading and writing files to communicate between the various processes during testing, use multiprocessing managed queues to send chess objects. This is much simpler than serializing and deserializing text. There is no chance for any test to overwrite communication from a different test.

Related Issues:

N/A

Checklist:

• I have read and followed the contribution guidelines.
• I have added necessary documentation (if applicable).
• The changes pass all existing tests.

Screenshots/logs (if applicable):

N/A

[AttackingOrDefending]

I think a comment making it obvious that lichess-bot plays black in tests should be included.