Fix PGlite.create options without a data directory

[psh4607]

작업 배경

The PGlite.create overload permits passing undefined as the data directory and providing options as the second argument. The implementation previously discarded those options and silently used the defaults.

티켓 및 링크

• Closes #773

작업 내용

• Fall back to the second options argument when the data directory is undefined.
• Add a regression test using the public debug option.
• Add a patch changeset for @electric-sql/pglite.

테스트

• pnpm --dir packages/pglite exec vitest run tests/instantiation.test.ts --reporter=dot
• pnpm --dir packages/pglite typecheck
• pnpm --dir packages/pglite stylecheck