Feature: support for user defined interceptors

[RequiemP]

Currently, Qdrant client only supports authentication via API key through the built-in TokenInterceptor. However, there are many scenarios where users need to add custom headers to requests like 'authorization' header for JWT

I've implemented a solution that makes the client generic over the interceptor type, allowing users to provide their own interceptors that can modify requests arbitrarily: #266

@timvisee

[ivandasch]

Yep, it seems to be very nice to have this feature. I.e user wants to obtain JWT token from some IAM service and periodically refresh it in background. It is possible to do only using some custom interceptor to set JWT token in headers this way