No report tag docs

[matmair]

Body of the issue

Problem

The docs are missing a list of available tags and their functions, making requests regarding reporting repetitive to answer

Suggested solution

Add a generation step similar to the one for settings that exports all available tags.

[matmair]

There could also be a CI step similar to the API doc diff stage that compares if tags changed and ensures proper docstrings are available.

[SchrodingersGat]

There are the following doc pages:

• Helper functions
• Barcodes

Or do you mean something else?

[matmair]

We seem to be missing docs on inventree_extras and plugin_extras