feat(crystal): add spec keybinds

Adds test running shortcuts similar to :lang ruby's.

modules/lang/crystal/config.el

@@ -5,7 +5,14 @@
     :definition #'crystal-def-jump
     :references #'crystal-tool-imp)
   (when (featurep! +lsp)
-    (add-hook 'crystal-mode-local-vars-hook #'lsp!)))
+    (add-hook 'crystal-mode-local-vars-hook #'lsp!))
+  (map! :localleader
+        :map crystal-mode-map
+        :prefix "t"
+        "a" #'crystal-spec-all
+        "v" #'crystal-spec-buffer
+        "s" #'crystal-spec-line
+        "t" #'crystal-spec-switch))
 
 
 (use-package! flycheck-crystal