tests (JSONScript): improve docs about JSONScript

[gesinn-it-ilm]

JSONScript support in SemanticResultFormats (SRF) relies on the functionality provided by Semantic MediaWiki (SMW).
Recently, documentation improvements were made in SMW (#6096) and similar enhancements should be applied to SRF.

This issue involves:

• Adding/updating the documentation for JSONScript usage in SRF.
• Ensuring consistency with the improvements made in SMW.
• Create script to automatically fetch the test cases, update the README.md file, and ensure that the list of tests is up to date with any changes made in the test case files.