Skip unsupported PostgreSQL views during import

[yzxcj797]

Summary

PostgreSQL schema imports currently fail when a CREATE VIEW statement contains a second SELECT after UNION. The SQL parser rejects that view shape before the surrounding tables can be imported.

The diagram model does not represent views, so this change adds a PostgreSQL-specific preprocessing pass that:

• splits SQL statements while respecting single/double-quoted strings, E'' escapes, line comments, nested block comments, and dollar-quoted bodies;
• recognizes CREATE, CREATE OR REPLACE, temporary, and materialized view declarations;
• omits those unsupported view statements before invoking the SQL parser;
• preserves all other statements, including semicolons inside strings and dollar-quoted procedural bodies.

Testing

• npm test — 4/4 tests pass
  • multi-SELECT view removal and successful parser round trip
  • temporary/materialized view forms
  • semicolons inside strings and dollar-quoted bodies
  • comments before a view declaration
• npm run lint — passes with zero warnings
• npm run build — passes (existing lottie-web eval and large-chunk warnings remain)
• npx prettier --check on the new files and package manifest — passes
• git diff --check — passes

Fixes #432.

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