Make ZAsync.as by-name

[vitaliihonta]

Changes being made

ZAsync.as now accepts a by-name parameter. It's useful in case a side effect is made in the as body

Additional context

Please provide any context of the changes if needed

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (6605875) 37.28% compared to head (449b8c9) 37.28%.

Files	Patch %	Lines
.../src/main/scala/zio/temporal/workflow/ZAsync.scala	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #140   +/-   ##
=======================================
  Coverage   37.28%   37.28%           
=======================================
  Files         126      126           
  Lines        4820     4820           
=======================================
  Hits         1797     1797           
  Misses       3023     3023           

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