Fix/defer parse validated schema objects

[tsg]

While sorting DDL statements in the schema, the code was missing two kinds:

• CREATE OR REPLACE VIEW (instead of just CREATE VIEW) which is used by pg_dump for circular views
• SQL functions with BEGIN ATOMIC / RETURN (...)

There are two integration tests added that each were reproducing one the two cases above.

• Test_SnapshotToPostgres_CircularDependencyView
• Test_SnapshotToPostgres_SQLStandardFunctionBodies

Type of Change

Please select the relevant option(s):

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• 🔧 Refactoring (no functional changes)
• ⚡ Performance improvement
• 🧪 Test coverage improvement
• 🔨 Build/CI changes
• 🧹 Code cleanup

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• All existing tests pass

Checklist

• Code follows project style guidelines
• Self-review completed
• Code is well-commented
• Documentation updated where necessary

Additional Notes

[github-actions]

Merging this branch will increase overall coverage

Impacted Packages	Coverage Δ	🤖
github.com/xataio/pgstream/pkg/snapshot/generator/postgres/schema/pgdumprestore	89.72% (+0.04%)	👍
github.com/xataio/pgstream/pkg/stream/integration	0.00% (ø)

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Coverage by file

Changed files (no unit tests)

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/xataio/pgstream/pkg/snapshot/generator/postgres/schema/pgdumprestore/snapshot_pg_dump_restore_generator.go	85.78% (+0.47%)	464 (+42)	398 (+38)	66 (+4)	👍

Please note that the "Total", "Covered", and "Missed" counts above refer to code statements instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code.

Changed unit test files

• github.com/xataio/pgstream/pkg/snapshot/generator/postgres/schema/pgdumprestore/snapshot_pg_dump_restore_generator_test.go
• github.com/xataio/pgstream/pkg/stream/integration/snapshot_pg_integration_test.go