Allow using `pytest-recording` with a command-line flag only about pytest-recording HOT 1 OPEN

Hi!

Yep, it could be a new CLI option that would work inside this condition elif vcr_markers or enable_recording:

This feature should be relatively straightforward to implement, I don't have the capacity to work on it myself but I will assist with reviews. I see the following steps:

• Extend pytest_addoption with a boolean option (similar to --disable-recording there)
• Create a fixture enable_recording (similar to this)
• Use the new enable_recording fixture inside vcr - elif vcr_markers or enable_recording:
• Check that --disable-recording and --enable-recording are not used together (e.g. inside these fixture definitions)
• Changelog entry
• A test to verify this CLI option works + a test for conflicting options (as per notes above)
• Document this flag in README

from pytest-recording.