Show extension maturity matrix on a tab

[holly-cummins]

We know we want to add filters and icons (or equivalent) for some extension metadata, such as dev services (#983). We could also visualise the entire maturity matrix of extensions, maybe on a tab, similar to what we do for community. The matrix is defined in quarkusio/quarkus#42446.

This would need quarkusio/quarkus#40336, and then it would need more work in quarkus core to discover the right attributes and generate the metadata. Some things we might not be able to discover by code inspection, and those tiles we'd perhaps need to leave grey.

Once we have the metadata, we can take a template svg and populate it. It would probably also be possible to use pure css + javascript. Some maturity matrices are just tables (examples). I like the one with the 'progress' line better, but I'm not totally sure how to do that in css. It's probably possible, but I'm not sure if it's more or less work than generating an svg.