Tracking: Consent Proof (Protos)

### Context

Add Protos for Consent Proofs outlined in XIP-43 (SMALL)
https://community.xmtp.org/t/xip-43-consent-proofs/552

### Progress

This change is complete when it has been implemented in all our SDKs:
  - [x] [xmtp-js](https://github.com/xmtp/xmtp-js/issues/594)
  - [x] [xmtp-ios](https://github.com/xmtp/xmtp-ios/issues/309)
  - [x] [xmtp-android](https://github.com/xmtp/xmtp-android/issues/220)
  - [ ] [xmtp-react-native](https://github.com/xmtp/xmtp-react-native/issues/354)
  - [x] Update [PROTOCOL.md](https://github.com/xmtp/proto/blob/main/PROTOCOL.md)


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Tracking: Consent Proof (Protos) #159

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Tracking: Consent Proof (Protos) #159

Description

Context

Progress

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

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