feat: add view tables to metaschema-schema

[pyramation]

feat: add view tables to metaschema-schema

Summary

Upstream view system tables from constructive-db PR #421 to the shared pgpm-modules package. This adds four new tables to support the views infrastructure:

• view: Main view definition table with schema reference, view_type (ViewTableProjection, ViewJoinedTables, ViewComposite, etc.), JSONB data for query configuration, and optional filter using Authz* node types
• view_table: Junction table linking views to their joined tables for referential integrity (used by ViewJoinedTables)
• view_grant: View-level permission grants (role, privilege, with_grant_option)
• view_rule: DO INSTEAD rules for views (e.g., read-only enforcement)

The view.table_id is intentionally nullable to support ViewComposite which doesn't have a primary table reference.

Updates since last revision

Updated metaschema-modules snapshot tests to reflect increased constraint counts. The new view tables have foreign keys to metaschema_public.database, schema, and table, which increases the FK constraint counts in the cross-schema queries used by the tests.

Review & Testing Checklist for Human

• Verify the pgpm.plan dependency order is correct (view must come before view_table, view_grant, view_rule)
• Confirm the table structures match what's expected in constructive-db PR #421
• Check that foreign key constraints reference the correct tables (schema, table, database)

Notes

This is a schema-only package. The tables have been tested in constructive-db PR #421 which uses this package as a dependency.

Requested by: Dan Lynch (@pyramation)
Link to Devin run: https://app.devin.ai/sessions/e705631c4cfd49e1bd051bf80c7f84a3

[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add '(aside)' to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment and CI monitoring