Analyze unsupported platform APIs

[Jim8y]

Summary

• add analyzer coverage for unsupported platform namespaces such as System.IO, System.Net, System.Reflection, and System.Threading
• report unsupported runtime types such as Console, DateTime, Guid, Random, and Environment
• register the new analyzer rule and cover namespace and type usages with tests

Validation

• dotnet test tests/Neo.SmartContract.Analyzer.UnitTests/Neo.SmartContract.Analyzer.UnitTests.csproj --filter "UnsupportedPlatformApiAnalyzerUnitTests" --no-restore
• dotnet test tests/Neo.SmartContract.Analyzer.UnitTests/Neo.SmartContract.Analyzer.UnitTests.csproj --no-restore

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.25%. Comparing base (3665f83) to head (6a9e329).

Additional details and impacted files

@@            Coverage Diff             @@
##           master-n3    #1594   +/-   ##
==========================================
  Coverage      80.24%   80.25%           
==========================================
  Files            295      295           
  Lines          25456    25456           
  Branches        3453     3453           
==========================================
+ Hits           20428    20429    +1     
  Misses          4132     4132           
+ Partials         896      895    -1     

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