Add service time for each tx

[haochizzle]

Story

As a user
I want see how long each tx took to settle cross-chain
So that I can at a glance quickly see speeds of cross-chain settlement on diff routes and tokens/messages.

Background

axelar scan has this feature: https://axelarscan.io/transfers/search under its status column, which shows a small timer icon with each txs' processing time. here is an example using the sygma dev test wallet transferring aUSDC btw sep -> mumbai https://testnet.axelarscan.io/address/0xD31E89feccCf6f2DE10EaC92ADffF48D802b695C?tab=token_transfers