[release] compatibility fixes, cli improvements and code formatting

this MR merges the changes from the develop branch into master. In particular it implements the following changes

• migrate to python-package-template, see merge request !60 (merged)
• implement custom warning handling, see merge request !61 (merged)
• fallback to nearest index when not found, see merge request !62 (merged)
• improve guessing of coordinates based on their names, see merge request !63 (merged)
• Add metadata info, see merge request !64 (merged), !65 (merged)
• Fix enhanced attrs, see merge request !66 (merged)
• improve cli yaml options, see merge request !67 (merged)
• minor fix for matplotlib 3.8 compatibility, see merge request !68 (merged)
• implement ci-matrix for different python and mpl versions, see merge request !69 (merged)
• Update plugin guide, see merge request !71 (merged)