refactor!: change the rlp codec of Hex

[KaoImin]

What this PR does / why we need it?

This PR change the rlp codec of Hex.
The previous implement convert Hex as String and the current implement convert it asVec<u8>. This saves half of the space, however, it is a breaking change.

What is the impact of this PR?

⚠️ This is a breaking change.

PR relation:

• Ref Store bytes in memory rather than hex string #1365
• Fix CI failed since #1371 #1383

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• commit id: 7ad4beb

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