Return assets from exported functions

[willvedd]

🔧 Changes

The CLI can be consumed as a node module. When currently invoked as such, there are no return values. This PR introduces the returning of the assets object on both import and export. This attempts to provide some useful information for the user to potentially act on or use to verify the expected results.

🔬 Testing

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (fa738a5) 84.23% compared to head (c858674) 84.19%.

Files	Patch %	Lines
src/commands/export.ts	50.00%	1 Missing ⚠️
src/commands/import.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #871      +/-   ##
==========================================
- Coverage   84.23%   84.19%   -0.05%     
==========================================
  Files         115      115              
  Lines        3610     3612       +2     
  Branches      700      700              
==========================================
  Hits         3041     3041              
- Misses        324      326       +2     
  Partials      245      245              

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