Add column sorting

[shogd3838]

Hello I don't know if it was already asked or if it's planned in future release but the ability to sort pods or any other content of the cluster by clicking on the column we want to order by would be very helpful.
For example I wanted to sort all the pods from my cluster by their status (ready, not ready), or by their CPU or Memory usage.

[jgillich]

Basic sorting has been added in 19d1d89

Not all columns are sortable yet, that will be extended over time