Add public API for TMSS 2.0 HHG Rate Query

[NairChandu]

API (google form) request has been already submitted.

API name : ratequeryhhg

API url for production:
https://tmss.gsa.gov/tmssserver/api/public/ratesquerydetails/ratequeryhhg

API url for test:
https:// tmss.preprod-acqit.helix.gsa.gov/tmssserver/api/public/ratesquerydetails/ratequeryhhg