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Show Flag Suggestions in GHCi (#23663)

Aaron Allen requested to merge aaronallen8455/ghc:aallen/23663/ghci-flag-suggestions into master

Makes suggestions when using :set in GHCi with a misspelled flag. This mirrors how invalid flags are handled when passed to GHC directly. Logic for producing flag suggestions was moved to GHC.Driver.Sesssion so it can be shared.

resolves #23663 (closed)

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