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[bot]]

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 :warning:

Additional details and impacted files

```diff @@ 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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