Added kubernetes-context plugin

[JannoTjarks]

This pull request is adding a plugin for kubernetes. It shows the current kubernetes status in the statusbar. It needs the tool kubectl installed.

With the variable dracula-kubernetes-context-label the user can add a prefix for the statusbar entry.

[pentago]

Any chance we can get this one today? :wink wink:

[JannoTjarks]

Hi @ethancedwards8 , what is the current status?

[ethancedwards8]

I'm hesitant to merge this because of the use of an external tool. I realize the Git module used an external tool, but it's more mainstream and widespread.

[JannoTjarks]

Hi @ethancedwards8, i understand your hesitate. But all users working with kubernetes got kubectl installed.

As @pentago shows, there is a wish/need for a plugin like this. There are also existing solution like https://github.com/jonmosco/kube-tmux which will not work which dracula/tmux. The users understand, that the need kubectl as binary installed. It should be enough, to communicate it to the users through the README.

[pentago]

Correct. If someone works with Kubernetes they abaolutely have kubectl installed, without it they can't interface with the API server so having kubectl is a must.