fix: preserve trailing slashes in import URLs

[hasundue]

• refactor(lib): normalize unversioned dependencies
• refactor(lib): an option to enable/disable cache
• test(lib): remove a trailing slash from redirect
• fix: preserve trailing slashes in import URLs

[codecov]

Codecov Report

Attention: Patch coverage is 94.52055% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 87.40%. Comparing base (5f0f698) to head (6d2366d).

Files	Patch %	Lines
lib/dependency.ts	91.66%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #139      +/-   ##
==========================================
+ Coverage   87.34%   87.40%   +0.05%     
==========================================
  Files          18       18              
  Lines         893      913      +20     
  Branches      139      146       +7     
==========================================
+ Hits          780      798      +18     
- Misses        113      115       +2     

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