[ETHEREUM-CONTRACTS] [WIP] cheaper balance checks & more

[d10r]

cheaper balance checks

When doing a transfer or starting a stream, we check if the sender has enough balance.
Instead of calculating the exact balance, it's enough to check if there's enough balance.
That can often be done much more cheaply, that is when a sender account has a lot of GDA pools connected.
Since the connected pools can only increase the balance, we can stop iterating as soon as the required balance threshold is met.

The current implementation violates the agreement abstraction because it needs to leave the GDA balance last.
This is made with the IDA deprecation already in mind (for this optimization to work well, we can have only 1 agreement with non-constant balance calculation cost).

This status is to be considered a PoC in order to test and show the idea, more attention should be paid to naming, avoidance of code reduncancy, testing, etc.

SuperTokenV1Library

• added flowWithCtx and flowFromWithCtx

[github-actions]

Changelog Reminder

Reminder to update the CHANGELOG.md for any of the modified packages in this PR.

• CHANGELOG.md modified
• Double check before merge