Create api module 'wbavailablebadges' to query all available badge items

The module expects no params and just returns all available badge items
that are specified in the config.

Bug: 63486
Change-Id: Iae97c4cf8a1c174b1466a80dea6bf5051fd590ab
Merge "Create api module 'wbavailablebadges' to query all available badge items"