Implement helm chart default values viewer and templates

[rosesyrett]

DAQ Core have a few repos with helm charts, and it'd be really nice to be able to view the default values (e.g. in a similar way as what is currently displayed in artifact hub) alongside the documentation.

While we could just add a tab for this in our own docs, I was wondering if we should think of a more generic solution first. Is this something backstage can support?

[garryod]

Definitely something we could add, but would be a lot of effort if someone hasn't already done it, fancy taking a look through the plugin catalog