Update and Refactor Codebase: Improve Async Usage, Package Management, and Code Quality

[lemillermicrosoft]

Summary

This pull request includes a series of updates and refactoring efforts across the codebase, focusing on improving async usage, introducing central package management, updating package references, and enhancing code quality and readability.

Changes

• Remove unnecessary TODO comment and severity setting in .editorconfig
• Set dotnet_diagnostic.CA2201.severity to none in .editorconfig
• Add dotnet_diagnostic.VSTHRD200.severity setting in .editorconfig
• Create Directory.Build.targets file to enable central package management and run 'dotnet format' on dev machines during Release builds
• Create Directory.Packages.props file to centrally manage package versions and include analyzers
• Enable central package management in Directory.Packages.props
• Add package versions and package references for analyzers in Directory.Packages.props
• Replace synchronous ReadToEnd with async ReadToEndAsync in multiple files
• Remove unnecessary newline characters in ConfigCommand.cs
• Change ConfigConstants class to static
• Update package references in SKonsole.csproj to use the latest versions without specifying version numbers
• Make GitDiffStaged method in GitSkill.cs async
• Update CondenseSkill.cs to use 'this' keyword for better readability
• Add RootNamespace to CondenseSkill.csproj
• Updated CondenseSkill.csproj and PRSkill.csproj files
• Refactored EnglishRobertaTokenizer.cs by making the class sealed
• Removed unnecessary using directives in PullRequestSkill.cs
• Updated PackageReference for Microsoft.SemanticKernel in PRSkill.csproj
• Simplified object creation in RedirectTextCompletionResult.cs
• Removed unnecessary whitespace and newline characters in various files
• Made FormatInstructionsProvider a static class
• Updated the output format instructions in FormatInstructionsProvider.cs

---

Powered by Microsoft Semantic Kernel

[lemillermicrosoft]

/sk generate-pr-description

[github-actions[bot]]

Generate PR Description: succeeded ✅ https://github.com/lemillermicrosoft/skonsole/actions/runs/6228997005