Stop using dry-run's cost

[tzaffi]

Cost is Deprecated in go-algorand's Dry Run

As of go-algorand PR #3957 the dry run response transaction top-level-field cost is being deprecated. There is one usage of this field in non-deprecated graviton code.

The good news is that new better fields BudgetConsumed and BudgetAdded are being introduced in the same PR and that the cost can be calculated as

net cost = BudgetConsumed - BudgetAdded

Action items

• go-algorand # 3957 is released
• have a PR that replaces cost with the net cost formula above and stops referencing the original cost field
• have a PR that allows accessing BudgetConsumed and BudgetAdded in the same way that cost is
• PR's above have been merged and released

[michaeldiamant]

Closing - https://github.com/algorand/graviton/releases/tag/v0.5.0 exists and algorand/pyteal#607 uses the functionality to implement OpUp tests.