fix(timeout): Add missing export for `timeout`

[mass2527]

Looks like the timeout function was mistakenly omitted from index.ts.

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Name	Status	Preview	Comments	Updated (UTC)
es-toolkit	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 23, 2024 11:54am

[codecov-commenter]

Codecov Report

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

Project coverage is 99.77%. Comparing base (3eb93e5) to head (166f801).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #421   +/-   ##
=======================================
  Coverage   99.77%   99.77%           
=======================================
  Files         161      161           
  Lines        1317     1317           
  Branches      357      357           
=======================================
  Hits         1314     1314           
  Misses          2        2           
  Partials        1        1