Define native function of `Test` contract in Cadence

[SupunS]

Issue to be solved

As discussed in #2783 (comment), once native function support is available in the checker (#2821), define the native functions that are currently being 'injected' to the test contract, also in Cadence.

Suggested Solution

No response

[j1010001]

@m-Peter is this still blocking you ?

[m-Peter]

Hey @j1010001, this is not blocking the current version of the testing framework we are about to release.
This is merely a technical debt, for a workaround that is already merged.
I am tackling the implementation of this in #2823, and it is almost done.
I have come across a limitation on defining optional arguments for functions in user-code: #2823 (comment). But we can possibly fix this by changing the API of these 2 methods.

[j1010001]

on hold until EVM is done