handle collation fetch response

### Description

After receiving a response from the collator we should handle the given data

- [ ] Setup the subsystem main loop to correctly handle the incoming response
- [ ] Setup the subsystem main loop to handle request timeouts
- [ ] Correct decoding for `request_v1` and `request_v2`

### Links

https://github.com/paritytech/polkadot-sdk/blob/c679ed79a1de575d4c3d5b8878b3e401b024f2f2/polkadot/node/network/collator-protocol/src/validator_side/mod.rs#L1977