feat(pack): Adding helm pack

lua/astrocommunity/pack/helm/README.md

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+# Helm Language Pack
+
+This plugin pack does the following:
+
+- Adds `go-template` Treesitter parsers
+- Adds `helm-ls` language server
+- Adds [vim-helm](https://github.com/towolf/vim-helm) for language specific tools

lua/astrocommunity/pack/helm/init.lua

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+local utils = require "astronvim.utils"
+return {
+  -- Helm support
+  {
+    "nvim-treesitter/nvim-treesitter",
+    optional = true,
+    dependencies = {
+      {
+        "ngalaiko/tree-sitter-go-template",
+        config = function()
+          require("nvim-treesitter.parsers").get_parser_configs().gotmpl = {
+            install_info = {
+              url = vim.fn.stdpath "data" .. "/lazy/tree-sitter-go-template",
+              files = "src/parser.c",
+            },
+            filetype = "helm",
+          }
+        end,
+      },
+    },
+  },
+  {
+    "williamboman/mason-lspconfig.nvim",
+    opts = function(_, opts)
+      opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, "helm_ls")
+
+      local configs = require "lspconfig.configs"
+      local lspconfig = require "lspconfig"
+      local util = require "lspconfig.util"
+
+      if not configs.helm_ls then
+        configs.helm_ls = {
+          default_config = {
+            cmd = { "helm_ls", "serve" },
+            filetypes = { "helm" },
+            root_dir = function(fname) return util.root_pattern "Chart.yaml"(fname) end,
+          },
+        }
+      end
+
+      lspconfig.helm_ls.setup {
+        filetypes = { "helm" },
+        cmd = { "helm_ls", "serve" },
+      }
+    end,
+  },
+  {
+    "towolf/vim-helm",
+    init = function()
+      local function helm_ft(path, _)
+        -- check if file is in templates folder or is helmfile
+        local path_regex = vim.regex "/templates/*\\.(tpl|yaml)$|*.gotmpl|helmfile*.yaml"
+        if path_regex and path_regex:match_str(path) then return "helm" end
+
+        -- return yaml if nothing else
+        return "yaml"
+      end
+
+      vim.filetype.add {
+        extension = {
+          yaml = helm_ft,
+        },
+      }
+    end,
+    ft = "helm",
+  },
+}