Benchmark transfer contract performance

[moCello]

Describe what you want implemented
Add a benchmark for the performance of the following transfer contracts:

• send_to_contract_transparent()
• send_to_contract_obfuscated()
• withdraw_from_transparent()
• withdraw_from_obfuscated()

Describe "Why" this is needed
With of the future integration of rusk-vm v2 it is important to know how the performance of the transfer contracts changes.

Describe alternatives you've considered
A benchmarking is the only sensible solution for this issue

Additional context
A benchmark for the gas consumption of the same transfer contracts will be added as well.

Disclaimer
For now we are actually not benchmarking the transfer contracts themselves but some wrapper functions. A probable performance change between Rusk v1 and Rusk v2 will be observable but it is important to note that the outcome of the benchmark is not the performance of the contract itself.