Allow configuring EJSON mode while parsing JSON files

[pkosiec]

• Allow configuring EJSON mode while parsing JSON files: from Core, CLI and Docker image
• Refactor loading options for CLI

Resolves #131

[codecov]

Codecov Report

Merging #143 (2c0766c) into master (b72c791) will decrease coverage by 0.80%.
The diff coverage is 89.65%.

@@            Coverage Diff             @@
##           master     #143      +/-   ##
==========================================
- Coverage   94.23%   93.43%   -0.81%     
==========================================
  Files          18       18              
  Lines         260      274      +14     
  Branches       46       49       +3     
==========================================
+ Hits          245      256      +11     
  Misses          7        7              
- Partials        8       11       +3     

Flag	Coverage Δ
cli	93.75% <88.00%> (-4.29%)	⬇️
core	93.33% <100.00%> (+0.03%)	⬆️

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Impacted Files	Coverage Δ
core/src/config.ts	93.75% <ø> (ø)
cli/src/options.ts	92.15% <88.00%> (-5.22%)	⬇️
core/src/populator/filesystem.ts	97.29% <100.00%> (ø)
core/src/populator/populator.ts	82.35% <100.00%> (+0.35%)	⬆️

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