ApiKey authentication

[alozano3]

Problem

There is no support for ApiKey Header authentication which is used in ES cloud version

Solution

Add a new property to put the API Key and use it to authenticate. It also checks if basic authentication is configured.

Does this solution apply anywhere else?

• yes
• no

If yes, where?

Test Strategy

Testing done:

• Unit tests
• Integration tests
• System tests
• Manual tests

Release Plan

[confluent-cla-assistant]

🎉 All Contributor License Agreements have been signed. Ready to merge.
✅ alozano3
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[cla-assistant]

All committers have signed the CLA.