Feature: Allow transactions with no signatures

[LudvikGalois]

What

Allow transactions with no signatures

Why

It's possible to create a script which requires no signatures to claim, but it's wasn't possible to
submit a transaction which claims from a script address without supplying at least one signature.

Personas - Who will this affect?

• SPO
• Dapp Devs
• Exchanges

Related issues

#3835

Acceptance Criteria

As a dapp developer I want

• cardano-cli transaction assemble to be able to sign/witness transaction for txin simple script where "type": "atLeast", "required": 0 without needing any skey.

Definition of done

• Code review
• Builds successfully on CI
• Includes documentation and/or examples for the functionality
• Log/record changes on Vnext (or similar depending on what we adopt)
• Ticket number included in PR description
• The new functionality is covered by dev/unit/property tests
• Acceptance Criteria met
• Test Engineering Sign-off + E2E automated tests

Sign-off

• Dev
• Test Engineering

Related PR

1. Allow assembling transactions with no witnesses #4408

[dorin100]

@CarlosLopezDeLara can you please add the AC?