Pass a list of files to the marine obs converter

[guillaumevernieres]

Description

This PR adds the possibility to process more than one file.

provider: RADS
window begin: 2018-04-15T06:00:00Z
window end: 2018-04-15T12:00:00Z
variable: absoluteDynamicTopography
output file: rads_adt_j3_2021182.ioda.nc
input files:
- rads_adt_j3_2021182.nc4
- rads_adt_j3_2021182.nc4

The 2 RADS obs files in the input files list are read in parallel, concatenated and written in the output file rads_adt_j3_2021182.ioda.nc.
Currently the code requires as many PE's as there are input files, not great, something that I might change later.

[AndrewEichmann-NOAA]

I presume we'll be testing this the coming week

[emcbot]

Automated Global-Workflow GDASApp Testing Results:
Machine: orion

Start: Mon Sep 25 09:02:50 CDT 2023 on Orion-login-1.HPC.MsState.Edu
---------------------------------------------------
Build:                                 *SUCCESS*
Build: Completed at Mon Sep 25 10:17:34 CDT 2023
---------------------------------------------------
Tests:                                 *SUCCESS*
Tests: Completed at Mon Sep 25 10:47:33 CDT 2023
Tests: 100% tests passed, 0 tests failed out of 53

[emcbot]

Automated Global-Workflow GDASApp Testing Results:
Machine: hera

Start: Mon Sep 25 14:05:04 UTC 2023 on hfe07
---------------------------------------------------
Build:                                 *SUCCESS*
Build: Completed at Mon Sep 25 15:15:22 UTC 2023
---------------------------------------------------
Tests:                                 *SUCCESS*
Tests: Completed at Mon Sep 25 16:16:33 UTC 2023
Tests: 100% tests passed, 0 tests failed out of 53

[rmclaren]

Suggested changes are up to you.