feat: add awk-language-server (#1665)

lua/lspconfig/server_configurations/awk_ls.lua

@@ -0,0 +1,22 @@
+if vim.version().major == 0 and vim.version().minor < 7 then
+  vim.notify('The AWK language server requires nvim >= 0.7', vim.log.levels.ERROR)
+  return
+end
+
+return {
+  default_config = {
+    cmd = { 'awk-language-server' },
+    filetypes = { 'awk' },
+    single_file_support = true,
+  },
+  docs = {
+    description = [[
+https://github.com/Beaglefoot/awk-language-server/
+
+`awk-language-server` can be installed via `npm`:
+```sh
+npm install -g awk-language-server
+```
+]],
+  },
+}