feat(lang): add support for helm chart templates (#2273)

* feat(lang): add support for helm chart templates

* fix(helm): stop yamlls and disable autostart

* fix(helm): stop yaml & docker compose lsp on helm file types

Revert disabling `autostart` since that kills the LSP globally even when
opening a standard yaml file, like GitHub Workflow file.

* fix(helm): remove docker compose lsp overrides

Since docker compose LSP does not seem to be triggered or started by
opening *.yaml helm files, the config overrides were removed to simplify
Helm config.

* fix(helm): ensure mason installs helm lsp

lua/lazyvim/plugins/extras/lang/helm.lua

@@ -0,0 +1,30 @@
+require("lazyvim.util").lsp.on_attach(function(client, buffer)
+  if client.name == "yamlls" then
+    if vim.api.nvim_get_option_value("filetype", { buf = buffer }) == "helm" then
+      vim.schedule(function()
+        vim.cmd("LspStop ++force yamlls")
+      end)
+    end
+  end
+end)
+
+return {
+  { "towolf/vim-helm", ft = "helm" },
+  {
+    "neovim/nvim-lspconfig",
+    opts = {
+      servers = {
+        yamlls = {},
+        helm_ls = {},
+      },
+    },
+  },
+  {
+    "williamboman/mason.nvim",
+    opts = function(_, opts)
+      vim.list_extend(opts.ensure_installed, {
+        "helm-ls",
+      })
+    end,
+  },
+}