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/config/default/+evil-bindings.el

@@ -39,13 +39,12 @@
 
 ;; Smart tab, these will only work in GUI Emacs
 (map! :i [tab] (cmds! (and (featurep! :editor snippets)
-                           (bound-and-true-p yas-minor-mode)
                            (yas-maybe-expand-abbrev-key-filter 'yas-expand))
                       #'yas-expand
                       (and (bound-and-true-p company-mode)
                            (featurep! :completion company +tng))
                       #'company-indent-or-complete-common)
-      :m [tab] (cmds! (and (bound-and-true-p yas-minor-mode)
+      :m [tab] (cmds! (and (featurep! :editor snippets)
                            (evil-visual-state-p)
                            (or (eq evil-visual-selection 'line)
                                (not (memq (char-after) (list ?\( ?\[ ?\{ ?\} ?\] ?\))))))