[K8s / Devops] Add more configurables to Helm and publish the charts

[hackintoshrao]

What version of Dgraph are you using?

v1.1

Helm needs more options to configure the deployment, here is the list:

• Configuration for anti-affinity between alphas and zero. This is required if the users want to schedule alphas and zeros on different nodes.

• Configuration to set the cache size and remove the lru_mb option.

• Publish the charts to the helm repo.

• Configuration to enable Prometheus deployment, alerts, and scraping.

• Configuration for node taints. This is required if the users don't want to schedule any other pods on the nodes where the database servers are running.

• Configuration to set both the initial resources to be allocated and resource limits for both alphas and zeros.

[sleto-it]

@hackintoshrao @prashant-shahi - see also #4616

[prashant-shahi]

@sleto-it I believe I can pick that task up. We can include this for the next sprint.

[minhaj-shakeel]

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