Add custom lsp-clients-extract-signature-on-hover
          #187
        
          
      
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It seems like emacs-lsp/lsp-mode#4362 didn't get any traction, so I'm following what was discussed in #151 and am creating an individual PR here instead.
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Commit Summary
Add custom lsp-clients-extract-signature-on-hover
This fixes a case where a type signature would be broken up over multiple lines, and we only display the first of these.
Fixes: #151
Related: emacs-lsp/lsp-mode#4362
Related: emacs-lsp/lsp-mode#1740