File inputs not able to be a single file

[lsetiawan]

Overview

John has discovered in #175 that when input files is set to be a single file rather than a glob path, it doesn't work. For example, if a user set a single file for pxp_tt like:

input_files:
    travel_times: 
      path: ./my_dir/pxp_tt

this will fail!

[lsetiawan]

The key function that creates the listing of path strings when glob path is given ** is called gather_files:

https://github.com/uw-ssec/offshore-geodesy/blob/d0f2bd01e387c287aa2b78eaaab007a82337a013/src/gnatss/main.py#L56-L59

The gather_files function returns a dictionary of the various InputData in the solver processing as such:

https://github.com/uw-ssec/offshore-geodesy/blob/d0f2bd01e387c287aa2b78eaaab007a82337a013/src/gnatss/configs/solver.py#L37-L50

will become:

{
  "sound_speed": str,
  "travel_times": List[str],
  "gps_solution": List[str],
  "deletions": str,
}

As you notice in above dictionary, I've matched the types to the expected input type for each loader function. Currently only "sound_speed" and "deletions" are expected to have single file.

[lsetiawan]

Proposed Solution

A solution to the above for this issue should be that every loader inputs should be a List[str] and that gather_files dictionary should output a List[str] to the file path.

Sample config input

input_files:
    sound_speed:
      path: ./tests/data/2022/NCL1/ctd/CTD_NCL1_Ch_Mi
    travel_times:
      path: ./tests/data/2022/NCL1/208/WG_20220727/pxp_tt
    gps_solution:
      path: ./tests/data/2022/NCL1/208/posfilter/POS_FREED_TRANS_TWTT
    deletions:
      path: ./tests/data/2022/NCL1/deletns.dat

The above inputs should output the following for the gather_files function

{
  "sound_speed": ["absolute/path/to/tests/data/2022/NCL1/ctd/CTD_NCL1_Ch_Mi"],
  "travel_times": ["absolute/path/to/tests/data/2022/NCL1/208/WG_20220727/pxp_tt"],
  "gps_solution": ["absolute/path/to/tests/data/2022/NCL1/208/posfilter/POS_FREED_TRANS_TWTT"],
  "deletions": ["absolute/path/to/tests/data/2022/NCL1/deletns.dat"],
}

The following functions should not fail when their respective list of path is given

load_sound_speed

https://github.com/uw-ssec/offshore-geodesy/blob/d0f2bd01e387c287aa2b78eaaab007a82337a013/src/gnatss/loaders.py#L35

load_deletions

https://github.com/uw-ssec/offshore-geodesy/blob/d0f2bd01e387c287aa2b78eaaab007a82337a013/src/gnatss/loaders.py#L262-L264