[TASK] Write Transaction Relaying Documentation

[akileshtangella]

https://www.notion.so/hicommonwealth/Transaction-Relaying-c603a743f5c74e5aa8c32889d5849069?pvs=4

Expand on following topics:

• [ ] What is transaction relaying in the MASP? Who are the parties involved?
• [ ] Why is transaction relaying necessary?
• [ ] What are the incentives/rewards for relaying a transaction?
• [ ] What data is sent to relayer?
• [ ] How is security/privacy preserved? Why can't relayer steal funds?

Outline

• [ ] Overview
• [ ] Lifecycle (where is data moving, what is being communicated, etc.)
• [ ] Implementation Details (smart contract calls, event watching, etc.)
• [ ] Fees and Incentives
• [ ] Privacy and Security
• [ ] Links (code links, repo links, etc.)