Unsigned Integers - Serialisation and Deserialisation

[krishnateja262]

To interact with contract functions that utilize U256 and U512 signatures, support is needed for the serialization and deserialization of these data types.

[krishnateja262]

#600 PR to resolve the issue

[zobaed066]

Bounds Checking: Ensure that the integer value is within the valid range for unsigned integers.
Endianness: Be mindful of endianness when serializing and deserializing binary data.
Data Format: Choose the appropriate format based on your storage or transmission needs.

[thiagodeev]

Implemented in starknet.go v0.8.0