chore: Drop py3.8 support | replace pkg_resource lib with importlib.resources

[OmerBhatti]

• Drop Py3.8 support
• Replace pkg_resources lib with importlib.resources

Ticket: Move on from deprecated pkg_resources api #150

PR is expected to merge after merging this PR : chore: Upgrade Python requirements

Followed migration guide: https://importlib-resources.readthedocs.io/en/latest/migration.html

Testing:
I have tested the changes with following steps:

• Install xblock-image-explorer into xblock-sdk
• Test image explorer xblock functionality
• Run tox tests

Screenshot after changes

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