feat: add ConversationMessageDefinition metadata support

[scolladon]

Explain your changes

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add ConversationMessageDefinition metadata support

Does this close any currently open issues?

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closes #898

[codeclimate]

Code Climate has analyzed commit bccb675 and detected 0 issues on this pull request.

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[scolladon]

Hi @callmekelvin

Could you help us testing this new metadata support please ?
You can do it by following those steps.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (41819da) to head (bccb675).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #899   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           40        40           
  Lines         1078      1078           
  Branches       114       114           
=========================================
  Hits          1078      1078           

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[github-actions]

Shipped in release v5.42.0.
You can install the new version using the version number or the latest-rc channel

$ sfdx plugins:install sfdx-git-delta@latest-rc
$ sfdx plugins:install sfdx-git-delta@v5.42.0

Happy incremental deployment!