Refactor logging extensions for extension members

[ncipollina]

Summary

• convert ILogger extension helpers to C# extension declarations across logging levels and base helper
• bump package version to 1.1.5
• enable MTP runner flags in CI workflows and mark tests present

Testing

• dotnet run --project test/LayeredCraft.StructuredLogging.Tests/LayeredCraft.StructuredLogging.Tests.csproj -f net8.0
• dotnet run --project test/LayeredCraft.StructuredLogging.Tests/LayeredCraft.StructuredLogging.Tests.csproj -f net9.0
• dotnet run --project test/LayeredCraft.StructuredLogging.Tests/LayeredCraft.StructuredLogging.Tests.csproj -f net10.0

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Extension declaration syntax breaks build

All logging helpers were rewritten using extension(ILogger logger) blocks and instance methods (e.g., Verbose(...) here), but the project still sets <LangVersion>default and targets netstandard2.0/net8/net9/net10, which only support classic static extension methods with a this ILogger parameter. With the current language version this syntax is not recognized and logger has no definition, so the library no longer compiles for any target (dotnet build will fail before tests run). Consider reverting to standard extension methods or enabling a preview language that supports extension declarations.

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