Proto commits in ChainSafe/gossamer

These 4 commits are when the Protocol Buffers files have changed:

Commit:ea5be08
Author:Eclésio Junior
Committer:GitHub

feat(dot/network/messages): define `StateRequest` and `StateResponse` proto messages (#4089)

The documentation is generated from this commit.

Commit:b25e0b4
Author:Eclésio Junior
Committer:GitHub

feat(dot/sync): Remove the `EndBlockHash` from `BlockRequestMessage` (#2977)

Commit:84883c6
Author:Quentin McGaw
Committer:GitHub

docs(copyright): Update copyright generation and notice per file (#1997) - Update copyright notice to 2021 - Update copyright for all Go and Proto files - Install `addlicense` `v1.0.0` in `Makefile` - Update `make license` command - Only include SPDX indentifier - Set copyright holder to 'Chainsafe Systems (ON)' - Set year to current year - Ignore all files that *should* be ignored - Run with verbosity - Add copyright check CI workflow

Commit:468091b
Author:noot
Committer:GitHub

update BlockRequest and BlockResponse to use protobuf encoding (#1282)