Better v4/5 compatibility wrt CRUD @omit

[innermatrix]

@benjie sent me here re this Discord thread https://discord.com/channels/489127045289476126/1163877919957995530

tldr:

• @omit create on a table prevents that table's row type from being used as a SQL function input
• Workaround is to use @behavior -resource:insert
• Proposed fix is to adjust behavior of @omit emulation in v5 to better reflect v4 behavior