Fetching baro assumes date or text

[jonbry]

The vast majority of our data is date time, but the marsFetchBaroData function only accepts dates. Passing a datetime value causes an NA:

pwdgsi/R/mars_data_fetch_write_functions.R

Lines 265 to 266 in f90bd1a

	start_date <- lubridate::ymd(start_date, tz = "America/New_York")
	end_date <- lubridate::ymd(end_date, tz = "America/New_York")

We can first check if they are date or datetime using lubridate::is.timepoint, then choosing ymd or as_date