chore: Split requests into their own sessiosn

[dariusc93]

Previously, we were processing the bitswap request in a single stream per peer, however while this method worked fine, we had issues when it comes to a large number of peers and conflicting requests, likely considered as a race when receiving a request and processing it in the stream while it is also later cancelled.

This PR solves this issue by splitting the stream into two streams, with each handling their own respective requests for that session. This allows us to add, remove, and change the state of each session.

Note:

• This change does remove sending multiple requests in a single message since each cid is processed in its own session, however this may change in the future where we can have a general session state that could collectively send multiple requests (and maybe multiple blocks) in a single message.