Triggers docs, syntax, limitations

[taroface]

DOC-10438 DOC-11539 DOC-11590 DOC-11681

• Triggers feature doc (Preview)
• CREATE TRIGGER (Preview)
• DROP TRIGGER (Preview)
• Triggers known limitations for v24.3
• Updates to related docs

Note that the CREATE/DROP TRIGGER SQL diagrams will not match the docs until https://github.com/cockroachdb/cockroach/pull/135051 merges.

[github-actions[bot]]

Files changed:

• src/current/_includes/v24.3/known-limitations/drop-trigger-limitations.md:
• src/current/v24.3/drop-trigger.md
• src/current/_includes/v24.3/known-limitations/trigger-limitations.md:
• src/current/v24.3/triggers.md
• src/current/v24.3/known-limitations.md
• src/current/_includes/v24.3/known-limitations/trigger-limitations.md:
• src/current/v24.3/triggers.md
• src/current/v24.3/known-limitations.md
• src/current/_includes/v24.3/sidebar-data/sql.json
• src/current/_includes/v24.3/sql/unsupported-postgres-features.md:
• src/current/v24.3/migration-overview.md
• src/current/v24.3/query-behavior-troubleshooting.md
• src/current/v24.3/postgresql-compatibility.md
• src/current/v24.3/migrate-from-postgres.md
• src/current/v24.3/cockroachdb-feature-availability.md
• src/current/v24.3/create-function.md
• src/current/v24.3/create-trigger.md
• src/current/v24.3/drop-trigger.md
• src/current/v24.3/known-limitations.md
• src/current/v24.3/sql-statements.md
• src/current/v24.3/string.md
• src/current/v24.3/triggers.md
• src/current/v24.3/user-defined-functions.md

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[taroface]

@DrewKimball Addressed your comments & had a follow-up question -- PTAL!