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…NFC] This patch is the first patch in a series reworking of Pete Lawrence's (@PortalPete) amazing proposal for better expression evaluator error messages (https://github.com/llvm/llvm-project/pull/80938) This patch is preparatory patch for improving the rendering of expression evaluator diagnostics. Currently diagnostics are rendered into a string and the command interpreter layer then textually parses words like "error:" to (sometimes) color the output accordingly. In order to enable user interfaces to do better with diagnostics, we need to store them in a machine-readable fromat. This patch does this by adding a new llvm::Error kind wrapping a DiagnosticDetail struct that is used when the error type is eErrorTypeExpression. Multiple diagnostics are modeled using llvm::ErrorList. Right now the extra information is not used by the CommandInterpreter, this will be added in a follow-up patch!
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