Add sortBy for tables

[nhemingway]

Closes #21

[hargut]

This is already possible with the following format:

namespace: namespaceName
groups:
    - name: group_1
      rules:
        <...>

[rohit907]

Does the cortextool has the ability to perform delete rules based on the namespace itself? if so can you share the binary version that I can use to perform it. .

mimirtool rules delete-namespace

Thanks is advance