Based on a recent HELP ticket, we'll probably want to refactor how we display storage size for collections and databases. Specifically, it's confusing that we currently display a value that is computed as storageSize - freeStorageSize (for DBs and the plugin header)

After chatting with diancheng.hu@mongodb.com, we'll probably want to:

• Display the uncompressed data size in a new column
• Use the tooltip on the "storage size" column to display information about the details of our computation/free vs. non-free storage size

We'll need to consider which value exactly to display in the initial "Storage size" column