Add support for Bun

[jamescmartinez]

Closes #247

Summary

Adds SQLite support for Bun, which makes OpenWorkflow Bun-compatible 🎊

[codecov]

Codecov Report

❌ Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
packages/openworkflow/sqlite/sqlite.ts	71.42%	2 Missing ⚠️

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[Copilot]

Pull request overview

This PR adds Bun runtime support to OpenWorkflow's SQLite backend, making OpenWorkflow compatible with both Node.js and Bun. The changes introduce runtime detection to dynamically load either node:sqlite (for Node.js) or bun:sqlite (for Bun), along with a common Database interface that both drivers satisfy.

Changes:

• Introduced runtime detection to support both Node.js (node:sqlite) and Bun (bun:sqlite) for SQLite operations
• Defined a common Database interface that abstracts the differences between the two SQLite implementations
• Simplified type casting in backend.ts by removing unnecessary double casts

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
packages/openworkflow/sqlite/sqlite.ts	Added runtime detection logic, Database interface abstraction, and dynamic require() for node:sqlite vs bun:sqlite
packages/openworkflow/sqlite/backend.ts	Simplified type casting from row as unknown as Type to row as Type for better readability

[jamescmartinez]

this had to be reverted in 5d6c607