Add Firebird support

[AdrianoHebreu]

Summary

• Add Firebird ORM support through firebird-core and the node-firebird driver.
• Add Drizzle Kit Firebird support for config validation, generate, migrate, pull, push, check, and the Studio backend proxy.
• Add Docker-backed Firebird tests for the ORM runtime and Drizzle Kit.

Notes

• The Studio backend currently uses a compatibility shim for the hosted local.drizzle.studio frontend by exposing Firebird through SQLite-shaped metadata/proxy responses.
• BLOB reads are covered, including multiple BLOB columns, but BLOB columns in RETURNING are guarded because of node-firebird driver limitations.
• time with time zone and timestamp with time zone still need deeper validation with node-firebird.

Tests

• pnpm --dir drizzle-orm exec tsc -p tsconfig.build.json --noEmit
• pnpm --dir drizzle-kit tsc
• pnpm --dir drizzle-kit exec vitest run tests/firebird/firebird-kit.test.ts
• pnpm --dir integration-tests test:firebird
• pnpm --dir drizzle-orm build
• pnpm --dir drizzle-kit build
• pnpm --dir drizzle-orm test -- tests/exports.test.ts
• git diff --check