Contract-Call? arg repr tests

[BowTiedWoo]

This PR adds test coverage for the contract-call? arguments representations in memory. These tests help ensure that function arguments are stored and handled correctly, particularly for memory allocation and representation consistency.

Related PR: stacks-network/stacks-core#6009
Related Issue: #633

[Acaccia]

I'm not sure I understand how those tests "ensure that function arguments are stored and handled correctly, particularly for memory allocation and representation consistency."

I understand that these tests are there to check the fix from stacks-network/stacks-core#6009, but here the fix is not applied yet. So if those tests don't fail with the current code, what are they supposed to show?

[BowTiedWoo]

Thank you for the feedback!

The reason the tests are not failing is due to the current implementation over-allocating space for argument representations.

These tests remain valid, as they are intended to verify the new implementation, which should allocate only the exact amount of space required.

[Acaccia]

I'm not super convinced here...
Could you please describe the testing process once the fix is applied? What should happen if it works? What should fail if it doesn't? For which reasons? How to debug? (etc...)

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