feat: rewrite int to bigint if its a primary key during schema sync

[levkk]

Rewrite INTEGER primary keys to BIGINT during schema-sync. This ensures they are compatible with pgdog.unique_id() and just generally don't run out of values.

[codecov]

Codecov Report

❌ Patch coverage is 88.80597% with 15 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pgdog/src/backend/schema/sync/pg_dump.rs	88.80%	15 Missing ⚠️

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