Allow storing Metadata/Tags on Types

What is the feature you'd like to have?
I want the ability to add tags (or general metadata, that's fine too) to Types in my analysis-- NOT to variables and things using the types, but to the types directly. Stuff like comments, plate comments, etc could be a derived feature from this, but is a bit fancier than what I'm thinking.

Is your feature request related to a problem?
My PDB loader can make lots of types with potential issues and the only way I know which ones are Spicy is by looking at the warnings when it loaded the first time. Afterwards, I have to guess and there's no persistent way to mark a type as "maybe wrong."

Are any alternative solutions acceptable?
I could rename all the types to Foo___idk_uses_virtual_stuff but that seems rather cumbersome

Additional Information:
Instead of 6 different types of metadata why not just centralize it all into Tags? Give them some more uses :)
Related to #1244 #4069

No implementation file or test is named. Start by reviewing related issues #1244 and #4069, then trace the public Type and tag concepts described in the request. Done should allow metadata or tags to be attached to types directly, persist after loading, and remain distinct from metadata on variables or other type users.