Enhancement: Add --indent-size and --indent-style options

[localheinz]

This PR

• adds --indent-size and --indent-style options

Fixes #17.

[codecov]

Codecov Report

Merging #35 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master    #35   +/-   ##
=======================================
  Coverage       100%   100%           
- Complexity       50     60   +10     
=======================================
  Files             7      7           
  Lines           172    218   +46     
=======================================
+ Hits            172    218   +46

Impacted Files	Coverage Δ	Complexity Δ
src/Command/NormalizeCommand.php	100% <100%> (ø)	25 <3> (+10)	⬆️
src/Normalizer/ComposerJsonNormalizer.php	100% <100%> (ø)	4 <0> (ø)	⬇️

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