Test Context on different version of Drupal 8, 9 and 10

Problem/Motivation

There was a very lengthly and "passionate" discussion about what version to add Drupal 10 support. Some were very pro switching semver 5.x for the D10 release and others very pro adding it to 8.x-4.2. Given that I'm new to maintaining this module, I went with the first advice that was provided which was the former. The following day the people passionate about the latter approach chimed in which has a lot of merit as well. In order to understand which version context is actually currently working on, this issue is to test the module on various versions of Drupal 8, 9 and 10 to gather information.

Steps to reproduce

Proposed resolution

Test on:

1. 8.6
2. 8.9
3. 9.5
4. 10.0
5. 10.1

Remaining tasks

1. Create some simple manual test cases
2. Test on the versions noted above
3. Based on this decide what additional D10 support may be warranted

User interface changes

API changes

Data model changes