Support httpHeaders in Probes

[burner1024]

Description of the feature or enhancement:

Allow to set httpHeaders, like so https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/#http-probes :

startupProbe:
  httpGet:
    httpHeaders:
      - name: User-Agent
        value: MyUserAgent

Use Case:

To allow probes to do basic authorization, for one.

Proposed Solution:

Other:

• 👋 I may be able to implement this feature request
• ⚠️ This feature might incur a breaking change

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This is a 🚀 Feature Request