Improve code consistency, CancellationToken support, and add skonsole.sln solution file

[lemillermicrosoft]

Fixes #12

Summary

This pull request includes changes to improve code consistency by updating variable names, adding CancellationToken support to various methods, and introducing a new solution file, skonsole.sln, to the project. The addition of this file will help improve the organization and structure of the project.

Changes

• Add CA2016 diagnostic rule to .editorconfig for forwarding CancellationToken parameters
• Update variable names in PromptChatCommand.cs for better consistency
• Change file constant name in ConfigurationProvider.cs and use System.IO.File for file operations
• Add CancellationToken support to EmailSkill.cs methods
• Add CancellationToken support to GitDiffStaged method in GitSkill.cs
• Update variable names in WriterSkill.cs for better consistency
• Add CancellationToken support to CondenseSkill.cs methods
• Add CancellationToken support to GenerateCommitMessage, GeneratePR_Rolling, and GeneratePR methods in PRSkill
• Update Condense method call in CondenseSkill to include cancellationToken
• Replace condenseSkill field with _condenseSkill for consistency with other fields in PRSkill
• Created a new solution file skonsole.sln
• Set the file mode to 100644
• Added GlobalSection and EndGlobal to the solution file

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[lemillermicrosoft]

/sk generate-pr-description

[github-actions[bot]]

Generate PR Description: succeeded ✅ https://github.com/lemillermicrosoft/skonsole/actions/runs/6270067883