Move sensor-related data structures to a sensor schema

[monica-pwd]

Complete the notional separation from the fieldwork app and separate sensor-related structures from the fieldwork schema

• fieldwork.tbl_inventory_sensors
• fieldwork.tbl_sensor_issue_lookup
• fieldwork.tbl_sensor_model_lookup
• fieldwork.tbl_sensor_purpose_lookup
• fieldwork.tbl_sensor_status_log
• fieldwork.tbl_sensor_status_lookup
• fieldwork.tbl_sensor_test_type_lookup
• fieldwork.tbl_sensor_tests
• fieldwork.tbl_sensortest_status_lookup (also rename this?)
• fieldwork.viw_sensor_current_status
• fieldwork.viw_sensor_recent_tests
• fieldwork.viw_sensor_tests_full

Modify to work with new schema:

• fieldwork.fun_sensor_isnt_deployed()

Create a sensors schema and move these there, completing any data structure cleanup as necessary, and ensuring continuity with other apps that touch these objects.