Add codeclimate diagnostics-format to validate command

[cykl]

Reason/Context

I would like to integrate the output of asyncapi validate to Gitlab's merge request.

Gitlab supports following artefact types.
While both Gitlab and asyncapi supports Junit format, it's not the most suitable format for this task.
It would be preferable to use codeclimate.

Description

It would be nice add support of codeclimate to validate --diagnastics-format.

Code climate specification is available here:

• https://docs.gitlab.com/ee/user/project/merge_requests/code_quality.html#implementing-a-custom-tool
• https://github.com/codeclimate/platform/blob/master/spec/analyzers/SPEC.md#data-types

Basic implementation should be easy and avoid users having to implement their own mapping steps.

For reference codeclimate support has been added to redocly-cli 18 months ago for this exact purpose.

[github-actions]

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[Amzani]

That would be great indeed, however, we have a dependency on spectral and that would be challenging to support
stoplightio/spectral#2283