refactor(csharp): rename asynchronous methods to have Async suffix

[lukaszzborek]

• rename async methods to have Async suffix (a few methods didn't have it)

BREAKING

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.87%. Comparing base (50557dc) to head (ce2fb3b).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...ign/csharp/Iggy_SDK/Publishers/IggyPublisherOfT.cs	0.00%	3 Missing ⚠️
...SDK/IggyClient/Implementations/TcpMessageStream.cs	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2994      +/-   ##
============================================
- Coverage     71.88%   71.87%   -0.02%     
  Complexity      930      930              
============================================
  Files          1117     1117              
  Lines         92952    92952              
  Branches      70474    70485      +11     
============================================
- Hits          66815    66805      -10     
+ Misses        23577    23576       -1     
- Partials       2560     2571      +11     

Flag	Coverage Δ
csharp	67.45% <71.42%> (-0.19%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
foreign/csharp/Iggy_SDK/Consumers/IggyConsumer.cs	62.00% <100.00%> (ø)
...sharp/Iggy_SDK/Contracts/Auth/GlobalPermissions.cs	100.00% <ø> (ø)
...DK/IggyClient/Implementations/HttpMessageStream.cs	71.72% <ø> (ø)
...oreign/csharp/Iggy_SDK/Publishers/IggyPublisher.cs	78.98% <100.00%> (ø)
...SDK/IggyClient/Implementations/TcpMessageStream.cs	76.33% <66.66%> (ø)
...ign/csharp/Iggy_SDK/Publishers/IggyPublisherOfT.cs	0.00% <0.00%> (ø)

... and 7 files with indirect coverage changes

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