Enable TempFileYStore to work with Jupyter Lab

[Darshan808]

Fixes #483

This PR updates TempFileYStore so it can be used via command-line configuration.

The class now:

• Inherits from LoggingConfigurable. (Config argument now gets passed here).
• Uses a combined metaclass just like SQLiteYStore

With this change, TempFileYStore behaves consistently like SQLiteYStore when selected from the CLI.

[github-actions]

👈 Launch a Binder on branch Darshan808/jupyter-collaboration/fix-TempFileYStore-implementation

[krassowski]

I think the only sane way to test this is to run ui-tests with a separate startup script to pass configuration like we do for timeline

https://github.com/jupyterlab/jupyter-collaboration/blob/main/ui-tests/playwright.config.js
https://github.com/jupyterlab/jupyter-collaboration/blob/main/ui-tests/playwright.timeline.config.js

jupyter-collaboration/.github/workflows/test.yml

Lines 294 to 298 in e52b144

	- name: run tests
	working-directory: ui-tests
	run: |
	jlpm test
	TIMELINE_FEATURE=1 jlpm test:timeline

(without the need to skip tests conditionally, but just running one test that would fail before this PR)