Add RLP library

[ernestognw]

Requires:

• Add Memory utility library #5189
• Add reverseBits operations to Bytes.sol #5724
• Add new clz(bytes) and clz(uint256) functions #5725

PR Checklist

• Tests
• Documentation
• Changeset entry (run npx changeset add)

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🦋 Changeset detected

Latest commit: da61a5e

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This PR includes changesets to release 1 package

Name	Type
openzeppelin-solidity	Minor

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[Amxx]

From the documentation, this has the same behavior as encode(bool). If there is no difference between the two, I'd only keep one.

[Amxx]

We should decide weither we are ok with the following feature:

• Memory slices (in memory.sol ?)
• Bytes accumulator (in bytes.sol ? in a dedicated file under struct ?)
• RLP encoder interface (uses Bytes accumulator)

Overall, we should also discuss naming of the functions in RLP.sol.