feat(emacs): add psalm integration for php-mode

Add the flycheck-psalm package and also add `.phpstub` files to be treated as
php files so we get all of the lsp and and syntax highlighting

site-modules/core/files/emacs/src/lang/php.el

@@ -6,9 +6,14 @@
 ;; licence that can be found in the LICENCE file or at
 ;; https://www.practically.io/copyright/
 
+
 (use-package php-mode
   :ensure t
-  :mode "\\.php\\'")
   :hook ((php-mode . (lambda() (setq flycheck-local-checkers '((lsp . ((next-checkers . (php))))))))
 		 (php-mode . lsp-deferred)
 		 (php-mode . tree-sitter-hl-mode))
+  :mode
+  (("\\.php\\'"      . php-mode)
+   ("\\.phpstub\\'"  . php-mode)))
+
+(use-package flycheck-psalm :ensure t)