Add buf inspect command to print information on types in a clean way similar to ls-files

[remyleone]

Feature

As a maintainer of custom generator I would like to have a view of all the different types that I'm using in my protobuf files.

It would be helpful to see what protobuf files are using which kind of types.

buf ls-types my_proto.proto

In case some types are deprecated, it would be helpful to be able to locate them.

Having statistics about the most used kind of types could also be helpful.

buf ls-types --report my_proto.proto
12 string
8 int
1 google.type.Decimal

Where am I using one of?
What are all the packages that are presents

buf ls-packages

buf ls-methods

Where am I using particular features of protobuf (about such and such editions for instance).
Having this kind of inventory could really help maintenance locate usage and plan migration accordingly.

[bufdev]

This is a fair feature request - at first glance, I'd recommend collapsing this down into a buf inspect sub-command`, we will want to think about the UX a little bit. Give us a bit to think about that and we'll get back to you.