Fix occurrences of sync-over-async

[Hawxy]

Replaces usages of Wait with WaitAsync, & Thread.Sleep with Task.Delay.

Partially addresses #106

[codecov]

Codecov Report

Merging #164 (c2847c2) into main (9e3e4f7) will decrease coverage by 0.26%.
The diff coverage is 98.11%.

@@            Coverage Diff             @@
##             main     #164      +/-   ##
==========================================
- Coverage   92.44%   92.17%   -0.27%     
==========================================
  Files          78       78              
  Lines        6125     6122       -3     
  Branches      378      378              
==========================================
- Hits         5662     5643      -19     
- Misses        376      391      +15     
- Partials       87       88       +1     

Impacted Files	Coverage Δ
RabbitMQ.Stream.Client/Producer.cs	77.94% <75.00%> (-0.50%)	⬇️
RabbitMQ.Stream.Client/Consumer.cs	91.89% <100.00%> (+2.70%)	⬆️
RabbitMQ.Stream.Client/HeartBeatHandler.cs	100.00% <100.00%> (ø)
...bitMQ.Stream.Client/Reliable/IReconnectStrategy.cs	100.00% <100.00%> (ø)
RabbitMQ.Stream.Client/Reliable/ReliableBase.cs	100.00% <100.00%> (ø)
...abbitMQ.Stream.Client/Reliable/ReliableConsumer.cs	98.68% <100.00%> (-0.02%)	⬇️
...abbitMQ.Stream.Client/Reliable/ReliableProducer.cs	86.90% <100.00%> (+0.07%)	⬆️
RabbitMQ.Stream.Client/RoutingClient.cs	98.61% <100.00%> (-0.06%)	⬇️
Tests/ReliableTests.cs	100.00% <100.00%> (ø)
Tests/UnitTests.cs	97.98% <100.00%> (ø)
... and 6 more

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[Gsantomaggio]

Looks good to me

[lukebakken]

Thank you

[Gsantomaggio]

Thank you @Hawxy