1933: Add spec file for LB

[JacobDomagala]

Fixes #1933

[github-actions]

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PR tests (gcc-7, ubuntu, mpich, trace runtime, LB)

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[nlslatt]

@JacobDomagala You'll need to re-push now that you've marked this as ready in order for the full PR testing to run.

[codecov]

Codecov Report

Merging #1982 (9061c71) into develop (eb27363) will increase coverage by 0.03%.
The diff coverage is 93.57%.

@@             Coverage Diff             @@
##           develop    #1982      +/-   ##
===========================================
+ Coverage    84.35%   84.38%   +0.03%     
===========================================
  Files          730      730              
  Lines        25569    25644      +75     
===========================================
+ Hits         21568    21640      +72     
- Misses        4001     4004       +3     

Impacted Files	Coverage Δ
src/vt/configs/arguments/app_config.h	100.00% <ø> (ø)
src/vt/trace/trace.cc	49.71% <0.00%> (ø)
src/vt/vrt/collection/balance/node_lb_data.h	100.00% <ø> (ø)
src/vt/utils/file_spec/spec.h	95.83% <83.33%> (ø)
src/vt/utils/file_spec/spec.cc	92.30% <90.00%> (ø)
src/vt/configs/arguments/args.cc	94.54% <100.00%> (+0.05%)	⬆️
src/vt/runtime/runtime.cc	74.88% <100.00%> (+0.05%)	⬆️
src/vt/vrt/collection/balance/node_lb_data.cc	83.33% <100.00%> (+2.03%)	⬆️
tests/unit/collection/test_lb.extended.cc	92.83% <100.00%> (+0.79%)	⬆️
tests/unit/trace/test_trace_spec_reader.cc	100.00% <100.00%> (ø)
... and 5 more

[nlslatt]

Looks good to me

[nmm0]

Can you add documentation for the format and its usage (you can just point the reader to the trace spec file since the format is the same)? I think it is also important in the documentation to highlight how this is different from the "LB Specification File" (--vt_lb_file_name)

[nmm0]

Looks good to me!