[feature] add pluggable support for hrequests

This looks like a cool library, especially the browser TLS fingerprint replication

https://github.com/daijro/hrequests

> Website bot detection systems typically do not correlate the TLS fingerprint browser version with the browser header.

> By adding more randomization to our headers, we can make our requests appear to be coming from a larger number of clients. We can make it seem like our requests are coming from a larger number of clients. This makes it harder for websites to identify and block our requests based on a consistent browser version.

Start by reviewing the hrequests project linked in the issue and how changedetection.io currently makes requests. Define the integration points and confirm what pluggable support, header randomization, and browser TLS fingerprint replication should cover; done requires an agreed design and working integration.

Written by the indexing model from the issue text.