Fix style in select classes to be more dotnet-like

[ricardSiliuk]

Misc fixes related to style. Basically prefixing private variables in select classes with _.

[codecov[bot]]

Codecov Report

Base: 92.70% // Head: 92.88% // Increases project coverage by +0.17% :tada:

Coverage data is based on head (966d235) compared to base (b91ab49). Patch coverage: 87.93% of modified lines in pull request are covered.

:exclamation: Current head 966d235 differs from pull request most recent head aba4ca6. Consider uploading reports for the commit aba4ca6 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #155      +/-   ##
==========================================
+ Coverage   92.70%   92.88%   +0.17%     
==========================================
  Files          94       94              
  Lines        7839     7840       +1     
  Branches      592      592              
==========================================
+ Hits         7267     7282      +15     
+ Misses        457      446      -11     
+ Partials      115      112       -3     

Impacted Files	Coverage Δ
RabbitMQ.Stream.Client/RawProducer.cs	82.79% <79.59%> (+1.86%)	:arrow_up:
RabbitMQ.Stream.Client/RawConsumer.cs	89.24% <90.62%> (+2.53%)	:arrow_up:
RabbitMQ.Stream.Client/StreamSystem.cs	86.58% <96.96%> (-0.06%)	:arrow_down:
...bitMQ.Stream.Client/Reliable/IReconnectStrategy.cs	80.95% <100.00%> (+2.00%)	:arrow_up:
RabbitMQ.Stream.Client/Client.cs	92.04% <0.00%> (+0.72%)	:arrow_up:
RabbitMQ.Stream.Client/Reliable/ReliableBase.cs	96.29% <0.00%> (+1.23%)	:arrow_up:
RabbitMQ.Stream.Client/Connection.cs	89.16% <0.00%> (+1.66%)	:arrow_up:

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[lukebakken]

I'll continue work on this PR since I should be able to push to your fork @ricardSiliuk. I need to reconcile the .editorconfig settings we use in this project with those in the .NET AMQP client.