[misc] add auth interfaces

[slin1237]

What type of PR is this?

/kind feature

What this PR does / why we need it:

this PR adds interface for multi cloud auth

Which issue(s) this PR fixes:

#94 #95 #96

Fixes #
#95 #96

Special notes for your reviewer:

Does this PR introduce a user-facing change?

[gemini-code-assist]

Summary of Changes

Hello @slin1237, 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 introduces a flexible and extensible authentication framework to support multi-cloud environments. It defines the core interfaces and a default implementation for managing credentials across different providers like OCI, AWS, GCP, Azure, and GitHub. The framework also includes a chain provider for trying multiple authentication methods and an HTTP transport for automatically signing HTTP requests.

Highlights

• Auth Interfaces: Introduces interfaces for multi-cloud authentication, including Provider, AuthType, Credentials, Config, and Factory.
• Default Factory Implementation: Adds a DefaultFactory struct that implements the Factory interface, allowing registration and creation of credentials for different providers.
• Provider Registration: Provides methods for registering provider factories with the DefaultFactory.
• Credentials Creation: Implements the Create method in DefaultFactory to create credentials based on the provided configuration, including fallback mechanisms.
• Supported Providers and Auth Types: Adds methods to retrieve supported providers and authentication types for each provider.
• Chain Provider: Introduces a ChainProvider to try multiple credential providers in sequence until one succeeds.
• HTTP Transport: Adds an HTTPTransport to wrap http.RoundTripper with authentication, signing requests with the appropriate auth headers.

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[gemini-code-assist]

Warning

Gemini encountered an error creating the review. You can try again by commenting /gemini review.

[slin1237]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces interfaces and a factory for multi-cloud authentication. The changes include new interfaces for providers and authentication types, a default factory implementation, and corresponding tests. The review identified potential race conditions in the global factory and the need for test isolation. Additionally, a suggestion was made to improve the structure of the fx module.

[slin1237]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces a flexible, multi-cloud authentication framework with a factory pattern for creating credentials. The interfaces are well-defined, and the implementation includes support for fallback configurations and dependency injection via fx. My review focuses on improving robustness by preventing infinite recursion in fallbacks, enhancing error diagnostics in the credential chain, and clarifying the fx module usage for better maintainability.