chore: add initial plugin folder structure #11

Job	Run time
tests (ubuntu-latest, 3.11, quality)	31s
tests (ubuntu-latest, 3.12, quality)	35s
tests (ubuntu-latest, 3.12, pii_check)	23s
tests (ubuntu-latest, 3.11, docs)	38s
tests (ubuntu-latest, 3.11, django52)	21s
tests (ubuntu-latest, 3.12, django52)	25s
tests (ubuntu-latest, 3.12, docs)	39s
tests (ubuntu-latest, 3.11, django42)	26s
tests (ubuntu-latest, 3.12, django42)	33s
tests (ubuntu-latest, 3.11, pii_check)	23s
	4m 54s

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