Add option to disable lookups for mysql-operator

[mayankmtg]

Debugging with helm template results in errors since 'lookup' functions return an empty interface.
Commands that fail because of this

helm install --dry-run mysql-operator
helm template mysql-operator
kubectl kustomize --enable-helm # while using charts with k8s kustomization

Refer issue helm/helm#8137

Workaround is similar to mysql-innodbcluster implementation for disableLookups

[mysql-oca-bot]

Hi, thank you for submitting this pull request. In order to consider your code we need you to sign the Oracle Contribution Agreement (OCA). Please review the details and follow the instructions at https://oca.opensource.oracle.com/
Please make sure to include your MySQL bug system user (email) in the returned form.
Thanks

[mayankmtg]

Done

[mysql-oca-bot]

Hi, there was no response to our request to sign an OCA or confirm the code is submitted under the terms of the OCA. As such this request will be closed.
Thanks

[mayankmtg]

I have a valid OCA.

[mysql-admin]

Reopening to allow for further processing

[mysql-oca-bot]

Hi, thank you for your contribution. Please confirm this code is submitted under the terms of the OCA (Oracle's Contribution Agreement) you have previously signed by cutting and pasting the following text as a comment:
"I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it."
Thanks

[mayankmtg]

I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it.

[mysql-oca-bot]

Hi, thank you for your contribution. Your code has been assigned to an internal queue. Please follow
bug http://bugs.mysql.com/bug.php?id=109746 for updates.
Thanks