Change functions of various arity returning Awaitable[T] to async functions returning T.

[nekitdev]

This allows for simpler code annotation-wise.

[codecov]

Codecov Report

Merging #15 (5bb815f) into main (5f62a6c) will increase coverage by 0.03%.
The diff coverage is 92.59%.

❗ Current head 5bb815f differs from pull request most recent head 372be15. Consider uploading reports for the commit 372be15 to get more accurate results

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
+ Coverage   37.81%   37.84%   +0.03%     
==========================================
  Files           8        8              
  Lines        3821     3823       +2     
==========================================
+ Hits         1445     1447       +2     
  Misses       2376     2376              

Impacted Files	Coverage Δ
iters/async_utils.py	21.48% <ø> (ø)
iters/async_iters.py	54.60% <92.30%> (+0.11%)	⬆️
iters/typing.py	90.56% <100.00%> (ø)

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