feat(async): add repeatable helper function

[lambdalisue]

Transform an async iterable into a repeatable async iterable. It caches the values of the original iterable so that it can be replayed. Useful for replaying the costly async iterable.

import { repeatable } from "@core/iterutil/async/repeatable";
import { assertEquals } from "@std/assert";

const origin = (async function* () {
  yield 1;
  yield 2;
  yield 3;
})();
const iter = repeatable(origin);
assertEquals(await Array.fromAsync(iter), [1, 2, 3]);
assertEquals(await Array.fromAsync(iter), [1, 2, 3]); // iter can be replayed
assertEquals(await Array.fromAsync(origin), []); // origin is already consumed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (85fd83b) to head (b0f587f).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #23   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          117       118    +1     
  Lines         1370      1409   +39     
  Branches       215       222    +7     
=========================================
+ Hits          1370      1409   +39     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.