[Proposal] KubeZoo supports authentication to its upstream cluster with service account tokens

[caohe]

What would you like to be added?

KubeZoo supports authentication to its upstream cluster with service account tokens.

Why is this needed?

Currently, KubeZoo supports using X.509 certificates to authenticate with its upstream cluster. However, some public cloud container services do not provide users with certificates as an authentication method. For example, AWS EKS only supports authentication with IAM tokens or service account tokens.

Considering that service account token is a common authentication method on most public clouds, KubeZoo needs to support it as an authentication method to the upstream cluster.