fix: split http instrumentation to core logic and http lib integration

[sagivoululumigo]

This is the first stage of adding native node fetch instrumentation.

This PR splits the existing http library instrumentation to the core logic of tracing a generic http request (the BaseHttp class) and the instrumentation connecting that logic to the http / https libraries (the Http class).

The next stage will be in a separate PR that will use the BaseHttp class to integrate to a new http library called undici (This is the library that native node fetch uses behind the scenes)