[Regions] Support created_at and updated_at filters

[callmekatootie]

Endpoint

I cannot figure out how to query using the created_at and updated_at fields - when I try with my local instance, the url is /store/regions?created_at[gt]=2022-10-10 which seems to work. But so does /store/regions?created_at[gt]=2022-10-15 - the returned records are all created on 12th October 2022 though.

Parking this for now until I figure it out.

NOTE I tried to pass it off as /store/regions?created_at={gt:"2022-10-10"} but this does not work