Feature/action claim count

[lucca65]

What issue does this PR close

Closes #215

Changes Proposed ( a list of new changes introduced by this PR)

• Adds a new field claimCount to the action object.
• This new field gives an easy count of all claims that action has
• It provides an optional status filter that allow to filter down the number to only the selected status.

How to test ( a list of instructions on how to test this PR)

• mix test

[lucca65]

@NeoVier I'll be merging this as I'm working on the shop, and it has migrations