# Description

Previously, while the manager classes supported "functional" class
terms, they only implemented `__call__` attribute. However, more
frequently, the class terms will keep some history in them which we
would want to clear out.

This MR introduces a `ManagerTerm` class for class terms which serves as
a protocol for how manager terms that are classes should be implemented.
The `ActionTerm` inherits from this `ManagerTerm`.

## Type of change

- New feature (non-breaking change which adds functionality)

## Checklist

- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./orbit.sh --format`
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file
- [x] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there