feat(sol-macro-expander): add Clone trait to enum contracts containers

[fd0r]

Motivation

The enum containers associated to contracts function calls, custom errors and events, don't implement the Clone trait while the underlying structs do.
Having the Clone trait propagated at this higher level is generally useful.

Solution

Add #[derive(Clone)] where the containers are defined.

PR Checklist

• Added Tests
  • No pre-existing test on which traits are implemented.
• Added Documentation
  • No pre-existing documentation on which traits are implemented in the custom containers.
• Breaking changes
  • Not a breaking change

[DaniPopes]

Thanks!

[mattsse]

this should always work because we do the same for the variants