Test tx

[eshelB]

This PR adds the following tests:

• ContractA.AddTx(InEuint32)
• ContractA -> ContractB.add(uint32, uint32) // Catches an Error!
• ContractA -> ContractB.add(euint32, inEuint32)
• ContractA -> ContractB.add(euint32, euint32)
• ContractA -> ContractB.add(euint32, euint32) (view instead of pure - adds an internal variable)
• ContractA -> delegateCall -> ContractB.add(uint32)
• ContractA -> delegateCall -> ContractB.add(inEuint32)
• ContractA -> delegateCall -> ContractB.add(euint32)

Note that one test fails! Maybe in caught an actual error, or maybe I did not understand something. It seems that, if we decrypt an euint, say:

uint32 a = FHE.decrypt(someEuint32);
uint32 c = a + b; // Execution reverted, cannot add with a, for some reason...

nitro: https://github.com/FhenixProtocol/nitro/pull/82 monday: https://fhenix.monday.com/boards/1216577959/views/4451803/pulses/1407336952