give more visibility into funding build-up

[chadwhitacre]

Now that we're charging in arrears, we need to give both ~users and Teams visibility in their funding build-ups. Reticketed from #3378.

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[chadwhitacre]

Here's what I'm currently seeing as the build-up for nuvola-player, e.g.:

=> select sum(due), count(*) from current_payment_instructions where due > 0 and team='nuvola-player';
┌───────┬───────┐
│  sum  │ count │
├───────┼───────┤
│ 79.18 │    59 │
└───────┴───────┘
(1 row)

However, I'm not sure how exactly this interacts with the is_funded column on current_payment_instructions.

[rohitpaulk]

There are two parts to this - the ~users UI, and Teams UI. The second part is blocked on #3705.