Consolidate redundant split_string_to_array, split_string_on & split_path methods

[dagardner-nv]

Description

• All three methods performed nearly identical operations, but were defined in anonymous namespaces and not exposed in a header preventing sharing.
• Consolidate all three into a new split_string_to_vector in string_utils.hpp

closes #454

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[codecov]

Codecov Report

Merging #465 (44af2e8) into branch-24.06 (5a6ae3c) will decrease coverage by 0.02%.
Report is 1 commits behind head on branch-24.06.
The diff coverage is 63.63%.

Additional details and impacted files

@@               Coverage Diff                @@
##           branch-24.06     #465      +/-   ##
================================================
- Coverage         73.82%   73.80%   -0.02%     
================================================
  Files               402      403       +1     
  Lines             14402    14398       -4     
  Branches           1130     1128       -2     
================================================
- Hits              10632    10627       -5     
- Misses             3770     3771       +1     

Flag	Coverage Δ
cpp	69.15% <63.63%> (-1.27%)	⬇️
py	41.86% <63.63%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
cpp/mrc/src/internal/utils/parse_ints.cpp	94.11% <100.00%> (-1.72%)	⬇️
cpp/mrc/src/public/utils/string_utils.cpp	100.00% <100.00%> (ø)
...mrc/_pymrc/include/pymrc/utilities/json_values.hpp	85.71% <ø> (ø)
python/mrc/_pymrc/src/utilities/json_values.cpp	93.39% <100.00%> (-0.13%)	⬇️
cpp/mrc/src/internal/utils/parse_config.cpp	0.00% <0.00%> (ø)

... and 3 files with indirect coverage changes

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[dagardner-nv]

/merge