Add ContractBytecodeDatabaseReadableKVState for reading contract runtime bytecode

[IvanKavaldzhiev]

Problem

We need to add a new type of database accessor to read contract runtime bytecode, so that we have specific ReadableKVState instance for this type of data.

Solution

Add ContractBytecodeDatabaseReadableKVState class that reads contract runtime bytecode data and converts the bytecode to Bytecode PBJ type.

Add unit tests to cover all cases including historical reads and correct mapping for all fields.

Alternatives

No response