Concurrent limit layer

Add concurrent request limit.

Notes

Users can control how many concurrent connections could be established between OpenDAL and underlying storage services.

All operators wrapped by this layer will share a common semaphore.

Examples

const op = new Operator("fs", { root: "/tmp" })

// Create a concurrent limit layer with 1024 permits
const limit = new ConcurrentLimitLayer(1024);
op.layer(limit.build());
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With HTTP concurrent limit:

const limit = new ConcurrentLimitLayer(1024);
limit.httpPermits = 512;
op.layer(limit.build());
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