Support custom TLS options

[ipy]

We are currently using qdrant-js in a Node.js environment where mTLS with self-signed certificates is enforced for secure communication. However, the current implementation of qdrant-js does not support custom TLS certificates.

Would it be possible to add an option to the client constructor for this purpose, or expose the underlying api client so that we can pass custom middlewares to the fetcher?

Ref: nodejs/node#48977