Restore Python 3.8/3.9 compatibility for unit-test collection

[Copilot]

make test-unit was failing on Python 3.8 and 3.9 during tests/conftest.py import. The failure came from runtime evaluation of newer type-hint syntax in modules pulled in during unit-test collection.

• Unit test collection

  • Removed eager py_moodle imports from /home/runner/work/python-moodle/python-moodle/tests/conftest.py
  • Deferred Moodle-specific imports into the integration fixtures that actually need them
  • Keeps tests/unit collection independent from the integration stack

• Python 3.8/3.9 compatibility

  • Added from __future__ import annotations to the modules reached by smoke tests:
    • /home/runner/work/python-moodle/python-moodle/src/py_moodle/session.py
    • /home/runner/work/python-moodle/python-moodle/src/py_moodle/course.py
    • /home/runner/work/python-moodle/python-moodle/src/py_moodle/folder.py
    • /home/runner/work/python-moodle/python-moodle/src/py_moodle/module.py
  • Prevents annotations like dict[str, ...] and str | None from being evaluated at import time on older supported interpreters

• Effect on CI

  • Restores the test-unit path for the supported Python matrix without changing integration-test behavior

Example of the compatibility change:

from __future__ import annotations

class MoodleSession:
    _cache: dict[str, "MoodleSession"] = {}

    @property
    def token(self) -> str | None:
        return self._token

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