DRAFT: Add model attr type enum #2977

Job	Run time
generate-lockfile	33s
poetry	23s
markdownlint	26s
check-docs-build	25s
djlint	23s
ruff-lint	27s
ruff-format	25s
changelog	21s
yamllint	22s
check-in-docker (3.10, 3.0.0)	7m 0s
unittest (3.13, mysql, stable)	14m 30s
unittest_report (3.13, postgresql, stable)	22m 0s
unittest (3.10, postgresql, stable)	19m 1s
unittest (3.10, postgresql, 3.0.0)	18m 9s
	1h 24m 25s

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