* client/network: Re-enable light_client_handler.rs unit tests

* client/network: Add scaffolding for light client using req-resp

* client/network: Make it compile

* client/network: Rename OutEvent SendRequest

* client/network: Restructure light client request client and handler

* client/network: Rename light client request client to sender

* client/network: Remove light client prepare_request

* client/network/src/light: Rework configuration

* client/network: Formatting

* client/network/light: Remove RequestId

* client/network/light: Make request functions methods

* client/network/light: Refactor request wrapping

* client/network/light: Fix warnings

* client/network/light: Serialize request in method

* client/network/light: Make returning response a method

* client/network/light: Depend on request response to timeout requests

* client/network: Fix test compilation

* client/network/light: Re-enable connection test

* client/network/light: Re-enable timeout test

* client/network/light: Re-enable incorrect_response test

* client/network/light: Re-enable wrong_response_type test

* client/network/light: Re-enable retry_count_failures test

* client/network/light: Re-enable issue_request tests

* client/network/light: Re-enable send_receive tests

* client/network/light: Deduplicate test logic

* client/network/light: Remove unused imports

* client/network/light: Handle request failure

* client/network/light: Move generate_protocol_config

* client/network: Fix test compilation

* client/network: Rename light client request client to sender

* client/network: Handle too-many-requests error

* client/network: Update outdated comments

* client/network/light: Choose any peer if none has best block defined

* .maintain: Replace sentry-node with local-docker-test-network

Sentry nodes are deprecated. Thus there is no need for
`.maintain/sentry-node` to spin up a sentry node test environment.
Instead this commit rewrites the setup to contain two full-connected
validators and one light client.

With the steps below one can now spin up a local test network with
two validators, one light-client, Prometheus and Grafana.

- cargo build --release
- sudo docker-compose -f .maintain/local-docker-test-network/docker-compose.yml up

* client/network/light: Handle oneshot cancellation

* client/network/light: Do not reduce retry count on missing peer

* client/network/request-response: Assert in debug request id to be unique

* client/network/light: Choose same limit as block request protocol

* client/network: Report reputation changes via response

Allow request response protocol handlers to issue reputation changes, by
sending them back along with the response payload.

* client/network: Remove resolved TODOs