Support calculating gas cost of whole test execution

[cptartur]

When running tests, we should be able to calculate its combined gas cost, that is: cost of all code in the test itself, probably extracted from the VM using starkware-libs/cairo#4084 + the cost of blockifier calls which we are already calculating.

We should create some interface that makes the combined cost of the test available in the run_from_test_case

starknet-foundry/crates/forge/src/running.rs

Line 72 in 894fedb

pub(crate) fn run_from_test_case(

function, so it can be then collected and displayed by forge.

Additionally:

• Address the TODO in code

[cptartur]

This is blocked by blockifier getting bumped to 2.3.0-rc0 or higher.

[Arcticae]

Please do create a follow-up to parse the result and display it (for forge-cli team)