feat(values) added extraObjects (FTI-4149)

[andrewgkew]

What this PR does / why we need it:

Added capability to create additional k8s resources as part of the helm release

Signed-off-by: Andrew Kew andrew@quadcorps.co.uk

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)

• fixes #
  FTI-4149

Special notes for your reviewer:

@scseanchow

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• PR is based off the current tip of the main branch.
• Changes are documented under the "Unreleased" header in CHANGELOG.md
• New or modified sections of values.yaml are documented in the README.md
• Commits follow the Kong commit message guidelines

[scseanchow]

Thank you @andrewgkew for the submission. For anyone coming to this PR after the fact, although we have implemented extraResources as a way to include additional Kubernetes resources, but best practices encourages the use of umbrella charts.