fix(lsp): advertise supported fold kinds (#34461)

This commit also makes it so that folds which have an unsupported fold
kind have their `kind` ignored.

runtime/lua/vim/lsp/protocol.lua

@@ -441,6 +441,9 @@ function protocol.make_client_capabilities()
       foldingRange = {
         dynamicRegistration = false,
         lineFoldingOnly = true,
+        foldingRangeKind = {
+          valueSet = { 'comment', 'imports', 'region' },
+        },
         foldingRange = {
           collapsedText = true,
         },