Update to new NRCS API

[micah-prime]

https://wcc.sc.egov.usda.gov/awdbRestApi/swagger-ui/index.html

Work to do

• Switch timeseries data to the api
• Switch metadata to the api
• Switch station search to the api (There is a not a good endpoint for this yet.)
• Rework tests for new data structure returns

[micah-prime]

Working here
#136