+ classes `BasePostKey`, `PostKeyWithParent`, `(Sub)?Reply` & `Thread… #213

Job	Run time
runs-on (macos-latest) / phpcs	1m 20s
runs-on (macos-latest) / phpmd	1m 37s
runs-on (macos-latest) / php-cs-fixer	1m 24s
runs-on (macos-latest) / phan	1m 17s
runs-on (macos-latest) / phpstan	1m 26s
runs-on (macos-latest) / phpunit-infection	2m 5s
runs-on (macos-latest) / pint	1m 30s
runs-on (macos-latest) / psalm	1m 30s
runs-on (ubuntu-latest) / phan	46s
runs-on (ubuntu-latest) / phpcs	19s
runs-on (ubuntu-latest) / php-cs-fixer	17s
runs-on (ubuntu-latest) / phpmd	17s
runs-on (ubuntu-latest) / phpstan	24s
runs-on (ubuntu-latest) / phpunit-infection	1m 31s
runs-on (ubuntu-latest) / pint	25s
runs-on (ubuntu-latest) / psalm	32s
runs-on (windows-latest) / phan	1m 39s
runs-on (windows-latest) / phpcs	1m 5s
runs-on (windows-latest) / php-cs-fixer	1m 2s
runs-on (windows-latest) / phpmd	1m 8s
runs-on (windows-latest) / phpstan	1m 15s
runs-on (windows-latest) / phpunit-infection	2m 16s
runs-on (windows-latest) / pint	57s
runs-on (windows-latest) / psalm	1m 0s
	27m 2s

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