Refactor HasRpcSupport

[javier-godoy]

I've made some refactors in HasRpcSupport that aim to pave the way for an upcoming feature. Here's a summary of the changes:

• Moved the InvocationHandler implementation to a standalone class, separating it from its previous location.
• Transferred the HasRpcSupport.call method to the InvocationHandler, providing a more cohesive structure (there is no need to have call as a public method in HasRpcSupport because RPC calls are started by the invocation handler)
• Altered the exception handling to be handled by the caller, enhancing the control flow and error management.
• Created a companion class to handle the implementation of createCallableProxy (that would have been a private method in HasRpcSupport but for now we have tp support Java 8).
• Conducted refactoring on the InvocationHandler to improve its overall structure and readability.