Add restart command and --watch option to wp shell #76

Job	Run time
code-quality / Lint PHP files	15s
code-quality / Lint GitHub Actions workflows	7s
code-quality / Lint Gherkin Feature files	22s
code-quality / Spell check	5s
code-quality / PHPCS	19s
code-quality / PHPStan	27s
	1m 35s

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