Add tzone attribute to all time columns

[ldecicco-USGS]

No description provided.

[ldecicco-USGS]

Also added new argument to peaks:

#' @param allow_incomplete_dates Logical whether to allow incomplete dates
#' in the "time" column to be converted to date objects (`TRUE`), or whether
#' to use the available year, month, day to get a character date only using
#' known values (`FALSE`). Default is `FALSE`. If `FALSE` but all dates are
#' complete the "time" column will remain a Date object.

Can try it out with this:

incomplete_dates <- read_waterdata_peaks(
               monitoring_location_id = "USGS-06334330",
               parameter_code = "00060")
incomplete_dates$time
 [1] "1972"       "1973"       "1974-01-16" "1975-03-25" "1976-02-14"
 [6] "1977"       "1978-03-22" "1979-07-25" "1980"       "1981"      
[11] "1982-06-06" "1982-10-09" "1984-07-07" "1985-03-17" "1986-03-17"
[16] "1987"       "1988"       "1989-03-10" "1990-06-16" "1991"      
[21] "1992-06-29" "1993-03-26" "1994-03-04" "1995-03-11" "1996-03-10"
[26] "1997-03-20" "1998-03-25" "1999-03-14" "2000-02-28" "2001-03-15"
[31] "2002-06-23" "2003"       "2004-08-03" "2005-08-11" "2006"      
[36] "2007-02-17" "2008-07-05" "2009-04-28" "2010-03-12" "2011-03-16"
[41] "2012"       "2013"       "2014-03-08" "2015-09-04" "2016-03-19"
[46] "2017"       "2018-04-23" "2019-03-23" "2019-10-20" "2020-02-28"
[51] "2020-06-30" "2021-04-09" "2022-05-30" "2023-06-27" "2024"      
[56] "2025-08-05"

[jzemmels]

These changes look good. Just a couple notes/suggestions

[jzemmels]

I think this description is concise and good, but I do think more emphasis could be placed on the fact that the default argument setting may return a time character column. Is this is the only read_waterdata function where that is the default behavior?

[jzemmels]

Given that this is kinda "fringe" behavior, I feel like it could use a unit test in tests_userFriendly_fxns.R to check that it works as-expected. Something like:

incomplete_dates <- read_waterdata_peaks(monitoring_location_id = "USGS-06334330")
expect_type(incomplete_dates$time, "character")