The service should process GET requests made to /api/v0/upcoming_hearings.json and respond with corresponding JSON data.

Clients should be able to request hearings which match certain criteria as exemplified by the following example requests:

• /api/v0/upcoming_hearings.json?citation_number=ABCDEFGH (citation search)
• /api/v0/upcoming_hearings.json?offender_tracking_number=123456789 (offender tracking number search)
• /api/v0/upcoming_hearings.json?defendant_name=Mike Jones (full defendant name search)
• /api/v0/upcoming_hearings.json?defendant_name=Mike (partial defendant name search)
• /api/v0/upcoming_hearings.json?defendant_name=Jones (partial defendant name search)