Lazy-load yasnippet harder for faster first-file load time

+ Rather than waiting for the first "interactive" major mode to be
  visited to activate yas-minor-mode, we wait until the first time the
  user invokes a snippet command to activate yas-global-mode.
+ yas-reload-all is one of the bottlenecks when loading a file for the
  first time. Deferring it further should help with this.
+ yas-global-mode reaches more major modes than our former list of
  hooks (fixes #5140).

Closes #5140

modules/lang/web/autoload/html.el

@@ -127,7 +127,8 @@ snippet, or `emmet-expand-yas'/`emmet-expand-line', depending on whether
               (not (or (memq (char-after) (list ?\n ?\s ?\t))
                        (eobp))))
           #'indent-for-tab-command)
-         ((bound-and-true-p yas-minor-mode)
+         ((featurep! :editor snippets)
+          (require 'yasnippet)
           (if (yas--templates-for-key-at-point)
               #'yas-expand
             #'emmet-expand-yas))