Fix ByteArray Issue

[byteZorvin]

This pr fixes #15.

• If we call name() on a token address by wrapping it in the new trait with ByteArray while it is using felt interface the call would fail when the dispatcher will try to deserialize the returned Span
• So we use the underlying syscall to make the call
• We can do a different kind of serialisation after checking the the length of the span(which will 1 for the felt and at 3 for ByteArray).
• But that is not required since the way to serialise is same and the deployment message is of fixed length (token_address,name,symbol,decimals) and while deserialising we could check the length of the payload to deserialise it accordingly

[apoorvsadana]

Suggested change

	// Openzeppelin erc20 used felt252 as return types for `name()` and `symbol()` while
	// Openzeppelin erc20 previously used felt252 as return types for `name()` and `symbol()` while