Add Clone implementations to all public types, where possible

[ilslv]

Synopsis

Not all types implement Clone. This could be useful, when we need to run cucumber multiple times with slightly changed config for example.

Solution

Add Clone implementations to all public types, where possible.

Checklist

• Created PR:
  • In draft mode
  • Name contains Draft: prefix
  • Name contains issue reference
  • Has assignee
• Documentation is updated (if required)
• Tests are updated (if required)
• Changes conform code style
• CHANGELOG entry is added (if required)
• FCM (final commit message) is posted
  • and approved
• Review is completed and changes are approved
• Before merge:
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  • PR's name and description are correct and up-to-date
  • Draft: prefix is removed
  • All temporary labels are removed

[ilslv]

FCM

Add `Clone` implementations to all public types, where possible (#238)

[ilslv]

I'll try to deal with failing skeptic tests in a separate PR. This is a known issue and I experienced it locally for a while. I'll also look into alternatives to skeptic.

[tyranron]

@ilslv

I'll also look into alternatives to skeptic.

mdbook test ? We do use it in juniper quite well. However, error reporting is not that nice as in skeptic.

[tyranron]

LGTM