feat: Implement the extensions RFC 0002 #326

Job	Run time
Python (macos-latest, 3.10) / macos-latest, python 3.10	50s
Python (macos-latest, 3.9) / macos-latest, python 3.9	58s
Python (macos-latest, 3.11) / macos-latest, python 3.11	36s
Python (macos-latest, 3.12) / macos-latest, python 3.12	40s
Python (ubuntu-latest, 3.10) / ubuntu-latest, python 3.10	42s
Python (ubuntu-latest, 3.11) / ubuntu-latest, python 3.11	41s
Python (ubuntu-latest, 3.12) / ubuntu-latest, python 3.12	44s
Python (ubuntu-latest, 3.9) / ubuntu-latest, python 3.9	40s
Python (windows-latest, 3.10) / windows-latest, python 3.10	1m 42s
Python (windows-latest, 3.11) / windows-latest, python 3.11	2m 25s
Python (windows-latest, 3.12) / windows-latest, python 3.12	1m 23s
Python (windows-latest, 3.9) / windows-latest, python 3.9	2m 27s
	13m 48s

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