MVS text_format and group_by_fields

[midlik]

Description

Added text_format parameter for label_from_* and tooltip_from_*.
Added group_by_fields parameter for label_from_*.

Associated molstar PR: molstar/molstar#1744

Actions

• Added description of changes to the [Unreleased] section of CHANGELOG.md
• When adding new features:
  • Added example(s) to app/api/examples.py
  • Added Jupyter Notebook to test-data/notebooks (python) and test-data/notebooks-ts (typescsript) with new features
  • Added MkDocs documentation in docs
• When changing the API, make sure the change is coherent between the TS and Python versions (see molviewspec-ts/readme.md).

[dsehnal]

Can you add an example usage for this to the web app?

[midlik]

Can you add an example usage for this to the web app?

You mean to the API examples?

[midlik]

Done