Instrument all Banzai::ReferenceParser classes

What does this MR do?

This MR instruments all the classes in the Banzai::ReferenceParser namespace.

Are there points in the code the reviewer needs to double check?

No.

Why was this MR needed?

The classes in question weren't instrumented meaning we have no idea how they're performing in production.

What are the relevant issue numbers?

None.

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Documentation created/updated
• API support added
• Tests
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together