Optimize Rlp Encoding

[benaadams]

Changes

• Use FrozenDictionary for encoder lookup
• Use struct wrapper for Type for dicitionary devirtualization
• Use Instance decoder for BlockInfo, Account, LogInfo rather than type lookup
• Use Instance decoder for Transaction rather than instatiating new one each time.
• Use 256bit assignment rather than Span copy for Hash256 encoding
• Seal TxDecoder and TrieNode
• Split Rlp and Non-Rlp key generation into seperate methods rather than checking on each loop iteration.

Types of changes

What types of changes does your code introduce?

• Optimization
• Refactoring

Testing

Requires testing

• No