Parse Date/Time/Timezone in samples/WQP

[ldecicco-USGS]

Both the WQP and samples output have sets of columns:

Activity_StartDate, Activity_StartTime, Activity_StartTimeZone
Activity_EndDate, Activity_EndTime, Activity_EndTimeZone
LabInfo_AnalysisStartDate, LabInfo_AnalysisStartTime, LabInfo_AnalysisStartTimeZone

The Time column comes in as whatever time zone is set in the TimeZone column. The TimeZones are in things like "EST", "EDT", etc. In R those are not legit timezones so we created an hour offset table:
https://github.com/DOI-USGS/dataRetrieval/blob/main/R/dataRetrieval-package.R#200

In R, we look for sets of 3 columns that have the Date/Time/TimeZone suffix:
https://github.com/DOI-USGS/dataRetrieval/blob/main/R/importWQP.R#176

Then send those 3 columns to create a _DateTime column (that comes back in UTC):
https://github.com/DOI-USGS/dataRetrieval/blob/main/R/importWQP.R#245

Because of the trickiness with the timezones, it would be nice if we could run this:

discrete_data, md_qw = waterdata.get_samples(
  monitoringLocationIdentifier = "USGS-11455508",
  usgsPCode = "00631",
  activityStartDateLower = "2024-01-01",
  activityStartDateUpper = "2024-06-01",
  profile = "basicphyschem"
)

and see a column like this returned:

discrete_data['Activity_StartDate'][1]
'2024-01-09'
 discrete_data['Activity_StartTime'][1]
'10:00:00'
 discrete_data['Activity_StartTimeZone'][1]
'PST'

discrete_data['Activity_StartDateTime'][1]
Timestamp('2024-01-09 18:00:00')

(not sure if that's exactly how it's printed out...)