Add support for Worker instances and module URLs in FsaNodeSyncAdapterWorker

[Copilot]

The FsaNodeSyncAdapterWorker.start() method now accepts either a Worker instance or a URL string, enabling compatibility with modern build tools like Vite that require module workers.

Changes Made

• Changed the first parameter from url: string to urlOrWorker: string | Worker
• Added automatic detection of module URLs containing type=module to create workers with { type: 'module' } options
• Maintained full backward compatibility with existing string URL usage

Usage Examples

Traditional URL (backward compatible):

const adapter = await FsaNodeSyncAdapterWorker.start('/worker.js', dir);

Module URL (for Vite and similar frameworks):

import MyWorker from '../worker?worker&url';
// MyWorker becomes '/src/worker.ts?type=module&worker_file'
const adapter = await FsaNodeSyncAdapterWorker.start(MyWorker, dir);

Pre-created Worker instance:

const worker = new Worker('/worker.js', { type: 'module' });
const adapter = await FsaNodeSyncAdapterWorker.start(worker, dir);

The implementation automatically detects URLs containing type=module and creates the worker with the appropriate options, making the fsa-to-node module compatible with modern bundlers that use ES module workers.

Fixes #974.

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[louwers]

@streamich Could you merge?