Add ABI bufr2IODA python converter and JSON file. (#1356)

[#115](NOAA-EMC/JEDI-T2O#115)

**New files include:**
- `parm/ioda/bufr2ioda/bufr2ioda_gsrcsr.json` : JSON containing data
format, sensor/bufr2ioda_gsrcsr.json, and satellite information
- `ush/ioda/bufr2ioda/bufr2ioda_gsrcsr.py` : bufr2ioda python code for
converting ABI GOES-16, GOES-17, and GOES-18 from BUFR to IODA
- Also added _abi_ to the observation list in
`jcb-prototype_3dvar.yaml.j2`

Co-authored-by: Azadeh Gholoubi <gholoubi@hercules-login-2.hpc.msstate.edu>

parm/atm/jcb-prototype_3dvar.yaml.j2

@@ -29,3 +29,4 @@ observations:
 #  - satwnd.viirs_npp
 #  - scatwind_ascat_metop-a
 #  - snowcvr
+   - abi_g16

parm/ioda/bufr2ioda/bufr2ioda_gsrcsr.json

@@ -0,0 +1,16 @@
+{
+  "data_format"      : "bufr_d",
+  "data_type"        : "gsrcsr",
+  "cycle_type"       : "{{ RUN }}",
+  "cycle_datetime"   : "{{ current_cycle | to_YMDH }}",
+  "dump_directory"   : "{{ DMPDIR }}",
+  "ioda_directory"   : "{{ COM_OBS }}",
+  "subsets"          : ['NC021046'],
+  "data_description" : "NC021046 ABI, GOES-16; NC021046 ABI, GOES-17,  NC021046 ABI, GOES-18", 
+  "data_provider"    : "U.S. NOAA/NESDIS",
+  "sensor_info"      : { "sensor_name": "ABI",  "sensor_full_name": "Advanced Baseline Imager",  "sensor_id": 617 },
+  "satellite_info"   : [
+                          { "satellite_name": "g16", "satellite_full_name": "GOES-16", "satellite_id": 270, "launch time": "20171119" },
+                          { "satellite_name": "g17", "satellite_full_name": "GOES-17", "satellite_id": 271, "launch time": "20180301" },
+                          { "satellite_name": "g18", "satellite_full_name": "GOES-18", "satellite_id": 272, "launch time": "20220301" } ]
+}