Move Language.Haskell.LSP.Messages into haskell-lsp-types

[lukel97]

No description provided.

[lukel97]

@alanz after thinking about this for a bit, I think the reason why it was not originally moved into haskell-lsp-types might have been that the wrapper types inside Language.Haskell.LSP.Messages aren't strictly a part of the LSP specification. They're types used only by haskell-lsp. Does it then make sense to leave them as a part of haskell-lsp? Or is it ok/used widely enough to consider moving into haskell-lsp-types?

[alanz]

Well, one argument is that the messages are part of the types.

My primary motivation for splitting them was to put all the TH stuff in a separate package that changed rarely, so working on haskell-lsp was not so achingly slow.

So using that criterion it should probably be called haskell-lsp-th-types, and we should try to limit them to that.

[wz1000]

Invalidated by #244