[HRnet] Current Employees table is very slow to load new data

[mja2128]

The table plugin that we use to list current employees is very slow to load new data when we add new employee records. It seems to be creating and loading the whole table each time. Let's create a React component that is smarter about rendering new data and only renders new rows when they are added.

Here is the jQuery plugin that we are currently using for the current employees list: https://github.com/DataTables/DataTables

Here's what it current looks like in the app: