[Feature]: Suport for msg::value() in motsu

[Ifechukwudaniel]

What is the feature you would like to see?

Add msg::value() support:
Implement msg::value() to allow contracts in motsu to retrieve the amount of native currency sent with a call.

The amount of value can be set during test contract deployment or invocation, simulating the behavior of real-world transactions.

#[motsu::test] fn test_payable_function(contract:TestContract) { let result = contract.payable_function(); assert_eq!(msg::value(), 1000); }

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[Ifechukwudaniel]

Can i take a stab at this

[XelHaku]

Allow to set sender and set value at macro level

[0xNeshi]

Closing this as duplicate of #12