Nested main modules

[Vakrim]

Idea for this was presented in #163.

This PR adds option that allows to have module and its dependencies in the same folder.

❯ destiny --nest-main-modules
...
├── (login.js is moved from here)
└── login
    ├── login.js (and it's now here)
    └── search.js (at the same level with dependency)

You can see extended example in #163

[codecov]

Codecov Report

Merging #164 (c57771d) into develop (3cfab83) will increase coverage by 0.27%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #164      +/-   ##
===========================================
+ Coverage    92.97%   93.25%   +0.27%     
===========================================
  Files           22       23       +1     
  Lines          598      608      +10     
  Branches       141      142       +1     
===========================================
+ Hits           556      567      +11     
+ Misses          42       41       -1     

Impacted Files	Coverage Δ
src/index.ts	68.57% <100.00%> (+1.40%)	⬆️
src/index/generateTrees.ts	100.00% <100.00%> (ø)
src/index/generateTrees/toFractalTree.ts	89.62% <100.00%> (+2.95%)	⬆️
...c/index/generateTrees/toFractalTree/getFileName.ts	100.00% <100.00%> (ø)
src/index/formatFileStructure/moveFiles.ts	86.20% <0.00%> (-6.90%)	⬇️

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[Vakrim]

I'm creating new folder for each "describe", because previously one was affecting other and changing order of tests was causing changes in snapshots