Improve visibility into transactions processing

[jmrossy]

State of Transaction

• Current state of tx
• Estimated time to completion, e.g. Stargate

Timeline Widget

Current behavior:
For most chains, the TransfersStatusModal shows a Timeline widget

Desired behavior:

Two improvements are needed:

1. The individual segments of the timeline should clickable external links to the corresponding transaction on the target chain's block explorer (example tx page.
2. The results from the useMessageTimeline hook (see Timeline in TransfersStatusModal) should be cached when the message is confirmed to be delivered so we don't re-request that data each time.

Item 1 will require changes to the timeline widget, which is in a separate repo here:
https://github.com/hyperlane-xyz/hyperlane-widgets - we may want to move this into monorepo

Use the multiProvider's method to get the explorer tx link.

[jmrossy]

Let's also decrease the font size of the Sent/Finalized/etc. labels while we're making this change
Done in css, nevermind

[jmrossy]

While fixing we should address this TODO as it relates to status caching mentioned in the description: https://github.com/hyperlane-xyz/hyperlane-warp-ui-template/blob/main/src/features/transfer/TransfersStatusModal.tsx#L142

[jmrossy]

The timeline is no longer in use but the useRecipientBalanceWatcher hook watches for increases in the recipient's balance and then pops a toast. However this solution was just a stop-gap and it doesn't work if the user clears the form. A better solution for be for the app to watch all pending transfers in a component higher than the TransferTokenForm