Add @showprogress macro

[YichengDWu]

Close #241

[codecov]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (d09e2ab) 60.04% compared to head (2ebb5e7) 58.81%.
Report is 5 commits behind head on main.

❗ Current head 2ebb5e7 differs from pull request most recent head 20c765a. Consider uploading reports for the commit 20c765a to get more accurate results

Files	Patch %	Lines
src/showprogress.jl	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #242      +/-   ##
==========================================
- Coverage   60.04%   58.81%   -1.23%     
==========================================
  Files          16       17       +1     
  Lines         991      998       +7     
==========================================
- Hits          595      587       -8     
- Misses        396      411      +15     

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