Add Solidity compatible address and byte types

[davidsemakula]

Summary

Closes - N/A

• [n] y/n | Does it introduce breaking changes?
• [n] y/n | Is it dependent on a specific version of cargo-contract or pallet-revive?

Adds Address and Byte types that can be unambiguously mapped to Solidity's address and bytes<N> (and bytes) types.

Description

See this discussion for rationale and additional details.

Checklist before requesting a review

• I have added an entry to CHANGELOG.md
• I have commented on my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules

[cmichi]

As discussed in Element, the PR should also change the function signature of e.g. self.env().address to return Address. I think there's more functions that return an H160 right now, when it's actually an Address.

What should also be done is go through the examples and see where a H160 is used, when it semantically should be an Address.