feat: add with_inputs and with_outputs to contract CallHandler

[hal3e]

Summary

This PR adds the possibility for the user to prepend specific inputs and outputs to CallHandlers. Use the with_inputs and with_outputs methods. If the custom inputs have coins that need to be signed, use the add_signer method.

Breaking Changes

• ContractCall new fields: inputs and outputs
• TransactionBuilders changed signature of unresolved_signatures to Vec<Arc<dyn Signer + Send + Sync>>
• TransactionBuilders removed clone_without_signers method. Use clone instead

Checklist

• All changes are covered by tests (or not applicable)
• All changes are documented (or not applicable)
• I reviewed the entire PR myself (preferably, on GH UI)
• I described all Breaking Changes (or there's none)