feat: add global labels and annotations

[Demonsthere]

Related Issue or Design Document

This PR adds a common pattern of global values to all charts, which allows to set some global labels and annotations which will be passed down to all pods in the chart

global:
  # -- Specify pod metadata, this metadata is added directly to the pod, and not higher objects
  podMetadata:
    # -- Extra pod level labels
    labels: {}
    # -- Extra pod level annotations
    annotations: {}

Checklist

• I have read the contributing guidelines and signed the CLA.
• I have referenced an issue containing the design document if my change introduces a new feature.
• I have read the security policy.
• I confirm that this pull request does not address a security vulnerability.
  If this pull request addresses a security vulnerability,
  I confirm that I got approval (please contact [email protected]) from the maintainers to push the changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added the necessary documentation within the code base (if appropriate).

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