feat: add xml documentation

[SergeyMenshykh]

This PR adds XML documentation to the codebase - classes and their methods. Additionally, it includes the following changes:

• Renames OAuthFlows.PasswordOAuthFlow to OAuthFlows.Password
• Renames OAuthFlows.ImplicitOAuthFlow to OAuthFlows.Implicit
• Renames ClientClientialsOAuthFlow to ClientCredentialsOAuthFlow
• Enables a code analyzer to enforce XML comments.

[gemini-code-assist]

Summary of Changes

Hello @SergeyMenshykh, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request primarily focuses on enhancing the code quality and maintainability by introducing extensive XML documentation throughout the project. This effort is complemented by the activation of new code analysis rules to enforce these documentation standards going forward. Additionally, a few naming inconsistencies related to OAuth flows have been resolved for better readability and alignment with industry standards.

Highlights

• XML Documentation: I've added comprehensive XML documentation to almost all public classes, interfaces, enums, properties, fields, and methods across the A2A.AspNetCore, A2A.Client, A2A.JsonRpc, A2A.Models, and A2A.Server namespaces. This significantly improves the discoverability and understanding of the codebase for developers using these libraries.
• Code Analyzer Enforcement: To ensure future adherence to documentation standards, I've enabled two new Roslynator code analyzer rules (RCS1141 and RCS1232) in the .editorconfig file. These rules will now warn if public members are missing XML comments or if the order of elements within documentation comments is incorrect.
• OAuth Flow Renames: For improved clarity and consistency with common OAuth terminology, I've renamed several properties within the OAuthFlows class in src/A2A/Models/SecurityScheme.cs. Specifically, OAuthFlows.PasswordOAuthFlow is now OAuthFlows.Password, OAuthFlows.ImplicitOAuthFlow is now OAuthFlows.Implicit, and the class ClientClientialsOAuthFlow has been corrected to ClientCredentialsOAuthFlow.

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[gemini-code-assist]

Code Review

This pull request introduces XML documentation to the codebase, renames some OAuthFlows, and enables a code analyzer to enforce XML comments.