Add phpstan-insert-dumptype command

[zonuexe]

This is a command to insert a function to display PHPStan types into the buffer.

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It is recommended to set it to a key that is easy to press, as shown below.

;; It can be typed in one stroke, but requires GUI Emacs.
(define-key php-mode-map (kbd "C-^") #'phpstan-insert-dumptype)

;;It can be typed in two strokes, but it works in the terminal.
(define-key php-mode-map (kbd "C-c ^") #'phpstan-insert-dumptype)

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If you put C-u before the key, \PHPStan\dumpPhpDocType() will be inserted.