[bitnami/kafka] adding a way to pass annotations to provisioning Pods

[pdemagny]

Description of the change

Hi,

First of all, thank you for sharing and maintaining these charts !
I propose this humble contribution to address a minor issue i ran into.

If you have Istio in your cluster, the provisionning Job never ends due to the istio sidecar running forever.
#5835 (comment) propose a way to keep the Pod in the Mesh but kill the proxy at the end of the Job.
This PR adds optional Pod annotations to the provisioning Pods.
It allows, for example, to completely disable Istio for the provisioning Job by passing the sidecar.istio.io/inject: "false" annotation.

Benefits

• Provides more control over the Kubernetes resources created by this chart.
• Allow a wider variety of use cases for Istio Mesh users.

Possible drawbacks

None that i can think of.

Applicable issues

Related to #5835

Additional information

N/A

Checklist

• Chart version bumped in Chart.yaml according to semver.
• Variables are documented in the README.md
• Title of the PR starts with chart name (e.g. [bitnami/<name_of_the_chart>])

[github-actions]

Great PR! Please pay attention to the following items before merging:

Files matching bitnami/*/values.yaml:

• Is the PR adding a new container? Please reviewer, add it to the models (internal process)
• Is the PR adding a new parameter? Please, ensure it’s documented in the README.md

This is an automatically generated QA checklist based on modified files

[marcosbc]

LGTM, thanks!