chore(debounce): fix types

[dayongkr]

Description

Before the changes, return type used a Template type F, but we don't return a func function.

Actually, we return a debounced function. So, I change return type.

And more accuracy, I change type of extends target and add a test case.

Before

Correct return type is (a: number) => void) & { cancel: () => void; }, but before type inference is not.

After

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Name	Status	Preview	Comments	Updated (UTC)
es-toolkit	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 31, 2024 2:01am

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.77%. Comparing base (367fc87) to head (094c8b3). Report is 699 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #406   +/-   ##
=======================================
  Coverage   99.77%   99.77%           
=======================================
  Files         165      165           
  Lines        1321     1321           
  Branches      357      357           
=======================================
  Hits         1318     1318           
  Misses          2        2           
  Partials        1        1           

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