feat(StdAssertions): Add assertEqCall

[0xPhaze]

Adds new assertions to StdAssertions.sol. These are useful for differential fuzz-testing calls.
Expects two calls to either return the same data or revert in the same way (if strictRevertData = true).

function assertEqCall(
    address targetA,
    bytes memory callDataA,
    address targetB,
    bytes memory callDataB,
    bool strictRevertData
) internal virtual;

[mds1]

A few small comments, otherwise this looks great!

[mds1]

Thanks @0xPhaze!