feat(provider): add Mailchimp provider

[michalbundyra]

What: add new provider - Mailchimp

Why: working in project where I am using this provider, so it might be useful also for others

How:

Checklist:

• Documentation
• Tests N/A ?
• Ready to be merged
  

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[balazsorban44]

Gotta love providers that implement OAuth in a way that "just works". 😁🎉 Nice PR, had a tiny comment, could you please check?

[balazsorban44]

@michalbundyra my question stands about the scope. I wasn't curious if you can remove it but rather if it really works for you locally without providing any? I assumed that you would need something as basic as openid or something like that

[michalbundyra]

@balazsorban44 in my code I have empty string for scope and it works, but I'll verify it again and will be back here. Thanks

[balazsorban44]

thanks! I really appreciate it! could you please revert the src/providers/index.js file change? that file is auto-generated now

[michalbundyra]

@balazsorban44 I checked again documentation and there is no single word about the scope. It works for me with empty scope tho.

It's now rebased, so merge conflicts are resolved. Thanks

[balazsorban44]

Thank you so much!

[github-actions]

🎉 This PR is included in version 3.16.0 🎉

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[github-actions]

🎉 This PR is included in version 4.0.0-next.5 🎉

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• GitHub release

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