Allow users to set a different path for kubeconfig

[lstocchi]

As in vscode, IJ kubernetes should have a setting to allow users specify a different path where to find the kubeconfig.

In vscode users can add multiple paths and then decide which one to use.

[adietish]

related to #278

[QuingKhaos]

Without configuring the kubeconfig to use, this plugin doesn't work. I structure my kubeconfigs into client related workspaces, exporting KUBECONFIG via direnv on bash, setting kubeconfig in the Kubernetes plugin by JetBrains per IntelliJ project.

Allowing plugin configuration is an important enhancement.

[adietish]

@QuingKhaos sorry for the late reply. There were quite some portions to change in order for KUBECONFIG to be supported in our plugin (ex. adding support in the kubernetes-client library). This was implemented in #779 and available in the latest release 1.5.0.

Closing as DONE.