Allow setting driver-writes-secrets argument via Helm values

[Elentary]

Providers binary supports specifying driver-writes-secrets bool argument to let the driver do the write instead of the plugin.
However, Helm chart currently does not allow to set this flag.

I see no reason in not having a Helm-chart value for this, especially taking into account the fact that this flag is required for deploying provider in self-hosted non-EKS clusters.

I would like to open a PR implementing this feature request if you do not mind.

[jbct]

Hi @Elentary - thanks for the issue and corresponding PR. Do you have any details behind why you need this to be available in the helm chart?