Add context for IO request in peer scoring logic.

## Issue summary

- We should pass separate context for every IO request instead of passing the context that is stored in the struct.
- https://github.com/ChainSafe/gossamer/pull/1791#discussion_r732754681

## Other information and links

-

Start by locating the peer scoring logic and its IO request call sites, then read the linked discussion in PR #1791 for the intended context handling. Done means each IO request receives separate context rather than the context stored in the struct; update relevant tests if they exist.

Written by the indexing model from the issue text.