1881 LB statistics json file opened too early

[nlslatt]

Open the LB statistics json file on first use so that apps have time to programmatically change the options.

Fixes #1881

[github-actions]

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[codecov]

Codecov Report

Merging #1886 (2b7ca89) into develop (bda9a9d) will decrease coverage by 0.00%.
The diff coverage is 77.77%.

@@             Coverage Diff             @@
##           develop    #1886      +/-   ##
===========================================
- Coverage    84.37%   84.37%   -0.01%     
===========================================
  Files          760      760              
  Lines        26791    26794       +3     
===========================================
+ Hits         22606    22607       +1     
- Misses        4185     4187       +2     

Impacted Files	Coverage Δ
...c/vt/vrt/collection/balance/lb_invoke/lb_manager.h	100.00% <ø> (ø)
.../vt/vrt/collection/balance/lb_invoke/lb_manager.cc	79.67% <77.77%> (-0.39%)	⬇️