Offline patch for sonde timeOffset

[delippi]

Description

In #496, it was shown that GSI applies special logic in read_prepbufr.F90 that overrides the twindow specified in the convinfo table for obs with balloon drift information. Essentially, GSI will attempt a fallback time (-3600s) if the original time falls outside the allowed window (5400s), and rejects the observation if the fallback still fails the new window check. This doesn't usually impact the 00/12z cycles since those are launch times. The impact from this change is usually noted in 01/13z cycles where the timeOffset can be -7500s (outside the -5400s time window) in which case, those obs gets snapped to -3600s.

This PR adds this capability to change the timeOffset of the data via the offline_ioda_patch.py utility. Here is an example call to use this new function:

./offline_ioda_patch.py -o ioda_adpupa.nc --patch-timeoffset

There are hard coded kx values so it is technically safe to run on any ioda file and should only change types 120/220 timeOffsets, but it will add a new metaData variable called origtimeOffset.

Issue(s) addressed

Resolves/Results are documented in Issue #496

Checklist

• I have performed a self-review of my own code.
• I have run rrfs tests before creating the PR (if applicable).
• Unit tests added/updated (if applicable).

[SamuelDegelia-NOAA]

LGTM!