Add symbol and type highlighting to F# diagnostics - #20097
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Implements highlighting for symbols and types in diagnostic messages to be used by IDEs and tools like F# Interactive.
To make it possible, this PR introduces
RichTexttype which wrapsTaggedText[]uses and making the code simpler to work with in existing FCS APIs like tooltips.The FSComp helpers generation is changed in a way that the same format works without changes, and only an additional
RichTextflag is needed in the fsproj.