refactor(src/utils): refactor some function signatures in src/utils

[K-tecchan]

The author should do the following, if applicable

src/utils/buffer.ts
changed to default argument because it seemed redundant to handle cases where a hash function was not passed as an argument.

src/utils/url.ts
changed signatures like getQueryParams

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.20%. Comparing base (c3679b8) to head (a8d6417).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3231      +/-   ##
==========================================
- Coverage   96.21%   96.20%   -0.01%     
==========================================
  Files         151      151              
  Lines       15096    15091       -5     
  Branches     2656     2672      +16     
==========================================
- Hits        14524    14519       -5     
  Misses        572      572              

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