[TASK] Create Transaction Relaying Diagram

[akileshtangella]

Related to #289

• Every step of the lifecycle section should be diagrammed in Excalidraw.
• Lifecycle should be about communication pattern between user and relayer.
• Steps should be numbered in order.

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