gnu: Add tree-sitter-go.

gnu/packages/tree-sitter.scm (tree-sitter-go): New variable.

gnu/packages/tree-sitter.scm

@@ -320,3 +320,13 @@ (define-public tree-sitter-elm
    "5.6.3"
    #:article "an"
    #:repository-url "https://github.com/elm-tooling/tree-sitter-elm"))
+
+(define-public tree-sitter-go
+  ;; There are a lot of additions, the last tag was placed more than 1 year ago
+  (let ((commit "64457ea6b73ef5422ed1687178d4545c3e91334a")
+        (revision "0"))
+    (tree-sitter-grammar
+     "go" "Go"
+     "16d32m78y8jricba9xav35c9y0k2r29irj5xyqgq24323yln9jnz"
+     (git-version "0.19.1" revision commit)
+     #:commit commit)))