Reduce LSP dependencies

[narnaud]

• [ ] Extract the LSP helpers in their own file (they could be made free methods, no need for a class):

  • TextLocation::fromLsp
  • CodeDocument::toPos
  • CodeDocument::fromPos
  • CodeDocument::toRange
  • CodeDocument::toUri

• [ ] Remove Lsp dependencies in Symbol

  • We could reduce the enum to what is supported, see TreeSitterHelper

[narnaud]

• Put that in a lsp_utils file in namespace Core::Utils.
• Move the Lsp::Utils::removeTypeAliasInformation method here
• Move the Lsp::Utils::toDocumentUri method as a static method into client.cpp
• Remove lsp_utils from the lib Lsp