[Diagnostics][SourceKit] Expose diagnostic educational notes through SourceKit requests #28203
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This is a follow-up to #28052 , which only included them in printed terminal output.
Like the rest of the feature, this is gated behind
-Xfrontend -enable-descriptive-diagnostics
since it's experimental. I'm not really sure what the process is for making changes to the protocol, but this should be backwards compatible at least.Marking this as a draft for now because I'm not sure what the performance implications are of passing the entire text of educational notes in a response dict over xpc. The alternatives I've come up with so far are: