Add qos_proto crate with protocol buffer types 1/5

[emostov]

Summary & Motivation (Problem vs. Solution)

This PR adds proto schemas and type generation, but does not modify any existing code

• Adds new qos_proto crate with protobuf definitions
• Contains .proto files for all protocol types (manifest, genesis, protocol messages, etc.)
• To minimize dep review, I chose to try and match the new deps up as closely as possible with our mono repo. This effectively means zero new dep review required
• Serde support for serializing all bytes to hex - this required me to add a custom serializer for Option<Vec<u8>> to get complete coverage

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	protobuf-src@​1.1.0%2B21.5
	serde@​1.0.228
	prost@​0.11.9
	tonic-build@​0.9.2

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