Add datasource.AnalyzeJSONString for external subcommand

[k1LoW]

No description provided.

[codecov]

Codecov Report

Merging #205 into master will decrease coverage by 0.93%.
The diff coverage is 38.46%.

@@            Coverage Diff             @@
##           master     #205      +/-   ##
==========================================
- Coverage   67.38%   66.45%   -0.94%     
==========================================
  Files          20       20              
  Lines        3419     3428       +9     
==========================================
- Hits         2304     2278      -26     
- Misses        880      918      +38     
+ Partials      235      232       -3     

Impacted Files	Coverage Δ
datasource/datasource.go	21.73% <38.46%> (-12.66%)	⬇️

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