Load fixed arrays from calldata

[clearloop]

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Describe the feature

#[zink::external]
fn foo(array: [U256, 2]) {
  // ...
}

Solution

1. register the array types to ABI
2. pass ABI to the compiler
3. in the code generator, detect the length of the arrays from function signature ( which is passed from 2. )
4. process the fixed length to bytecode for operating this type