Add support for new golang go.work files

The new golang 1.18 version (currently in beta) [introduced](https://github.com/golang/go/issues/45713) a new file type
called `go.work`.

This commit adds support for the syntax of that file using the https://github.com/omertuc/tree-sitter-go-work repository
That repository is heavily based on previous work in the https://github.com/camdencheek/tree-sitter-go-mod repository, with a few
minor changes to make it work on the very similar `go.work` files.

lua/nvim-treesitter/parsers.lua

@@ -184,6 +184,16 @@ list.gomod = {
   filetype = "gomod",
 }
 
+list.gowork = {
+  install_info = {
+    url = "https://github.com/omertuc/tree-sitter-go-work",
+    branch = "main",
+    files = { "src/parser.c" },
+  },
+  maintainers = { "@omertuc" },
+  filetype = "gowork",
+}
+
 list.graphql = {
   install_info = {
     url = "https://github.com/bkegley/tree-sitter-graphql",