SNOW-817091 async executions documentation

[sfc-gh-knozderko]

Description

Async executions documentation.

Checklist

• Code compiles correctly
• Code is formatted according to Coding Conventions
• Created tests which fail without the change (if possible)
• All tests passing (dotnet test)
• Extended the README / documentation, if necessary
• Provide JIRA issue id (if possible) or GitHub issue id in PR name

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.28%. Comparing base (5aec6b4) to head (f631c92).

❗ Current head f631c92 differs from pull request most recent head 67bbe2b. Consider uploading reports for the commit 67bbe2b to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #896   +/-   ##
=======================================
  Coverage   84.28%   84.28%           
=======================================
  Files          89       89           
  Lines        9649     9649           
  Branches      912      912           
=======================================
  Hits         8133     8133           
  Misses       1282     1282           
  Partials      234      234           

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