Provide newtype wrappers for new number types of lsp spec 3.16

From https://github.com/haskell/lsp/issues/134#issuecomment-914558600 by @pranaysashank  (thanks!)

> Since 3.16, there are new number types https://microsoft.github.io/language-server-protocol/specifications/specification-current/#number . We may want to provide newtype wrappers for them as using Int may lead to subtle bugs like haskell/haskell-language-server#2169