feat: provider-states / describe-versions in environment / delete-version-(tag|webhook) / get-pacts

[YOU54F]

It's an annual leave bonanza!

• add provider-states list command.
  • requires pact_broker v2.115.0 or later
  • chose over list-provider-states which is more aligned with current convention
  • it feels like create-environment, delete-environment could be simplified with environment (create|delete|list etc), same for other commands.
• add describe-versions with support for environment + released / deployed
  • Get latest provider version for a specific environment pact_broker-client#165
  • Support environment/releases on describe-version pact_broker-client#164
  • CLI for getting supported version for specific participant pact_broker-client#163
• add delete-version-tag
  • Add delete tag to CLI pact_broker-client#61
• add delete-webhook
  • Ability to delete a webhook pact_broker-client#166
• add get-pacts
  • for provider, by consumer branch
  • requires unreleased changes, see PR's
    • feat: add provider pacts by branch endpoints pact_broker#728
    • fix: pacts by branch hal relations pact_broker#858
• add custom-header argument which can be repeated
  • Support for Custom Headers (e.g., CF-Access-Client-Id/Secret) in Pact CLI pact_broker-client#185

All new pacts validated against pact_broker with pact-ruby core verifier, as part of this PR pact-foundation/pact_broker#848