feat(csharp): add TCP/TLS producer and consumer examples

[atharvalade]

Which issue does this PR close?

Closes #2806

Rationale

The C# SDK had comprehensive TLS integration tests but no TLS examples in examples/csharp/ for users to reference.

What changed?

Users had to read the integration test source to understand TLS configuration despite the SDK having full TLS support via TlsSettings.

Added TcpTls example projects with producer and consumer demonstrating IggyClientConfigurator with TlsSettings (Enabled, Hostname, CertificatePath) pointing to core/certs/iggy_ca_cert.pem. Registered new projects in Iggy_SDK.Examples.sln under a TcpTls solution folder.

Local Execution

Passed. dotnet build Iggy_SDK.Examples.sln succeeds with 0 warnings, 0 errors.

AI Usage

1. Opus 4.6
2. guided by existing GettingStarted examples and IggyTlsConnectionTests.cs TLS config patterns
3. Compiled and built locally, verified code follows existing patterns exactly
4. Yes

[atharvalade]

Resolved

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.43%. Comparing base (514b5c5) to head (096ce74).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2821      +/-   ##
============================================
- Coverage     71.44%   71.43%   -0.02%     
  Complexity      708      708              
============================================
  Files           969      969              
  Lines         78219    78219              
  Branches      60029    60039      +10     
============================================
- Hits          55884    55874      -10     
  Misses        20002    20002              
- Partials       2333     2343      +10     

Flag	Coverage Δ
csharp	67.06% <ø> (-0.19%)	⬇️

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[mmodzelewski]

@atharvalade same as with Java PR, the examples should be included in the README.

@lukaszzborek please have a look when you can.

[lukaszzborek]

Overall looks good, but 2 points

1. add this example into README file in examples/csharp directory to be run by CI
2. iggy server used by this example not use tls in configuration. Propably we need to run second instance in script with different configuration with tls (need to be check)
   @hubcio

[hubcio]

@lukaszzborek this will not be that simple because we'd have to restart server - there is either normal unencrypted TCP or TLS TCP. I'd say that we create separate instance for server for TLS tests. @atharvalade can you figure it out? see scripts/run-csharp-examples-from-readme.sh

[atharvalade]

@lukaszzborek this will not be that simple because we'd have to restart server - there is either normal unencrypted TCP or TLS TCP. I'd say that we create separate instance for server for TLS tests. @atharvalade can you figure it out? see scripts/run-csharp-examples-from-readme.sh

give me some time, I'll look into this.