fix(types): cannot .use non-return mw from createMiddleware

[NamesMT]

Resolves #4462

The author should do the following, if applicable

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

Additional context

TS seems to does not raise an error when R doesn't actually extends HandlerResponse<any>, and implicitly type R as HandlerResponse<any> directly for cases where R is non-extending.

This PR checks for a case where R might be void, and assign it as non-typed Response, i.e.: the default value, so it prevents the created middleware being HandlerResponse<any> and broke some types chain like direct .use.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.36%. Comparing base (5eb7c15) to head (7b7558a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4465   +/-   ##
=======================================
  Coverage   91.36%   91.36%           
=======================================
  Files         173      173           
  Lines       11146    11146           
  Branches     3214     3214           
=======================================
  Hits        10183    10183           
  Misses        962      962           
  Partials        1        1           

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[yusukebe]

LGTM!

[yusukebe]

@NamesMT Thank you!