Make technology, geo, rank, and category parameters optional

[max-ostapenko]

Closes HTTPArchive/httparchive.org#1182

API Parameter Handling Improvements:

• Made technology, geo, and rank parameters optional (defaulting to 'ALL') for the /adoption, /cwv, /lighthouse, /page-weight, and /audits endpoints.

Documentation Updates:

• Updated the README.md to indicate that technology, geo, rank, and category parameters are now optional and default to 'ALL' where applicable.

Test Suite Enhancements:

• Updated and expanded API route tests to verify that endpoints handle missing or empty technology, geo, and rank parameters by defaulting to 'ALL' and returning valid results, instead of returning errors.
• Improved the shell API test script to include filter verification logic, ensuring that API responses match the requested filters and that default values are correctly applied.

[max-ostapenko]

The requests are keep coming, I'd like to merge this.
@tunetheweb any reservations?

[tunetheweb]

Sorry didn't realise you were waiting on me. Merge away!