Add billable minutes to case review in registry

[karkar]

Problem
Case reviews are also considered billable for SWs.

Describe Desired Solution
Add a field for entering billable minutes in case review similar to add session

Describe Alternatives

Additional Context

[karkar]

I am not sure if this includes any schema updates

[jinasuh]

@anantmittal Please let me know if the change in the schema is correct. adf7c3e