Make Remote Cluster Client and AOS client fully async

[dbwiddis]

Description

Removes blocking calls from the Remote Cluster Client and AOS Client implementations.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.51%. Comparing base (e7e2fcd) to head (af6c81f).

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #80      +/-   ##
============================================
- Coverage     82.56%   80.51%   -2.05%     
- Complexity      309      322      +13     
============================================
  Files            25       25              
  Lines          1233     1278      +45     
  Branches        112      114       +2     
============================================
+ Hits           1018     1029      +11     
- Misses          160      193      +33     
- Partials         55       56       +1     

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