Add date/time to listed transactions

[Boombastic]

Is your feature request related to a problem? Please describe.
Transactions are indexed and identified by extrinsic right now, no date/time info is revealed, which is not convenient for the human actors.

Describe the solution you'd like

1. Add the date/time column in the transaction list or smaller date/time text below extrinsic id
2. Add the date/time column in the action column as well, currently signer action is marked by extrinsic as well.
3. Possibly add a streamlined view that reveals WHEN the multi-sig transaction is

• Initiated (The first signer's tx's state label might be “Initiated")
• Each signature (The rest signer's tx's state labels remain "Signed" or "Approved")
• Executed (The last signer's tx's state label might be "Executed")

The above presentation logic applies to the current 3 transaction lists: In Progress, Confirmed and Cancelled

See attached screenshot for your reference.

[Yakio]