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Move warning flag handling into Flags module

Sylvain Henry requested to merge hsyl20/ghc:hsyl20/dynflags/logger into master 
I need this to make the Logger independent of DynFlags.

Also fix copy-paste errors: Opt_WarnNonCanonicalMonadInstances
was associated to "noncanonical-monadfail-instances" (MonadFailInstances vs
MonadInstances).

In the process I've also made the default name for each flag more
explicit.

This is preliminary work for #19877 (closed) (making systools independent of DynFlags).

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