[WalletApp] order subscriptions by most recent message and display number of new messages on subscription cell

[llbartekll]

Is your feature request related to a problem? Please describe.

Ordering the list by recent mesages, and showing message counts, etc
(eg None of these have any messages, but I have 3 in GM but it isn't at the top, and there is no way to know what ones have messages)

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Describe alternatives you've considered
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Additional context
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