fix(yaml): yaml validate and enable line folding (#1251)

* fix(yaml): enable validate

see https://github.com/redhat-developer/yaml-language-server#language-server-settings

* feat(yaml): support line folding

lua/lazyvim/plugins/extras/lang/yaml.lua

@@ -21,6 +21,15 @@ return {
       -- make sure mason installs the server
       servers = {
         yamlls = {
+          -- Have to add this for yamlls to understand that we support line folding
+          capabilities = {
+            textDocument = {
+              foldingRange = {
+                dynamicRegistration = false,
+                lineFoldingOnly = true,
+              },
+            },
+          },
           -- lazy-load schemastore when needed
           on_new_config = function(new_config)
             new_config.settings.yaml.schemas = new_config.settings.yaml.schemas or {}
@@ -33,7 +42,7 @@ return {
               format = {
                 enable = true,
               },
-              validate = { enable = true },
+              validate = true,
               schemaStore = {
                 -- Must disable built-in schemaStore support to use
                 -- schemas from SchemaStore.nvim plugin