[Feature] Intelligent Wallet Utilization

[jcace]

Update the wallet selection used to make deals, based on datacap remaining.

Algorithm will go roughly like this, when deciding which wallet to use:

• Pick the wallet with the least available datacap, as long as it's above some datacap renewal threshold (need to know the threshold that re-triggers the Fil+ Bot), this way, datacap is used sequentially so that future traunches can be unlocked
• If a wallet has = or < the threshold, move on to the next one
• If all wallets are below the threshold, then choose the wallet with the most amount of datacap available
• If all wallets are = or < a bare minimum threshold, do not make a deal and return an error

In order for this to work efficiently, we may need to poll the datacap balance and cache it as I believe it's a relatively slow operation to look it up.

[jcace]

I confirmed with the Fil+ team, the threshold is 75% of the datacap used up.

So, for instance if the traunche is 256TiB, then once it's down to 64TiB it should be ready to unlock the next traunche.