LSP: Add workspace.applyEdit client capabilities (#12313)

applyEdit is supported by the built-in client.

runtime/lua/vim/lsp/protocol.lua

@@ -703,6 +703,7 @@ function protocol.make_client_capabilities()
         };
         hierarchicalWorkspaceSymbolSupport = true;
       };
+      applyEdit = true;
     };
     experimental = nil;
   }