Feature add bounty to phase

[Vayras]

Describe your changes

added a property phase_uuid and phase_priority to bounties in order to relate them to phases within features.

Issue ticket number and link

#1662

Type of change

Please delete options that are not relevant.

• [x] New feature (non-breaking change which adds functionality)

Checklist before requesting a review

• [x] I have performed a self-review of my code