Make default configuration installable on most platforms

[tennix]

Feature Request

Currently, the default tidb cluster configuration is for "half-production". This makes it difficult to deploy for the first time, but also not production-ready configuration. Users have to tune the parameters in the default values.yaml to make it production-ready.

To overcome this dilemma, we should make the default installation available for most platforms including minikube and kind. So users can have a real quick-start experience using tidb-operator. As for production deployment, we can provide a detailed guide about the best practice and how to adjust parameters to make TiDB cluster both secure, stable and performant.

[tennix]

Managed platforms like GKE, EKS, minikube, kind all enables DefaultStorageClass admission controller to set a default storage class when a PVC does not specify a storage class.
ref: https://kubernetes.io/docs/reference/access-authn-authz/admission-controllers/#defaultstorageclass

[aylei]

ref: #700

[aylei]

This should be included in 1.1

[cofyc]

this will be addressed by #1111 and #1449.
and we should have an e2e job to verify it in one node cluster started by minkube or kind

[cofyc]

I'm going to add some basic e2e tests in Github Actions.