Update USGS Instant Values endpoint.

[ktarbet]

Longer term USGS will support URLS that start with api.*

ref:
https://waterdata.usgs.gov/blog/api-waterservices-decom/

The following URL may break in the next year or two:

base_url = "https://waterservices.usgs.gov/nwis/iv/?"

ref:
https://github.com/HydrologicEngineeringCenter/cwms-cli/blob/main/cwmscli/usgs/getusgs_cda.py#L193C2-L193C58

replacement:
https://api.waterdata.usgs.gov/ogcapi/v0/collections/continuous

[msweier]

Looks like the USGS pages have migrated to the new API. If you use the "Network" tab on developer tools you can see how they are calling this stuff. The tsid is now a uuid (an example stage query below)
https://api.waterdata.usgs.gov/ogcapi/v0/collections/continuous/items?limit=50000&properties=time,value,unit_of_measure,approval_status,qualifier&time_series_id=3b48c2ad254848feb8d9ddec426999f5&time=P30D