[misc] add aws auth for accesskey, ip, assumerole, wi, etc

[slin1237]

What type of PR is this?

/kind feature

What this PR does / why we need it:

multi cloud support, aws auth is needed

Which issue(s) this PR fixes:

#94 #106 #107 #108 #109 #110 #111

Fixes #
#106 #107 #108 #109 #110 #111

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 comprehensive AWS authentication support, enabling the application to authenticate using various methods such as access keys, IAM roles, web identity, and ECS task roles. It includes configuration structures, credential management, and request signing capabilities to facilitate secure access to AWS resources.

Highlights

• AWS Authentication: Adds support for various AWS authentication methods including Access Key, Assume Role, Web Identity, ECS Task Role, Process, and Default.
• Configuration: Introduces new configuration structs for each authentication method, including validation functions.
• Credentials Provider: Implements an AWSCredentials struct that handles retrieving and caching credentials using the AWS SDK.
• Request Signing: Adds functionality to sign HTTP requests using AWS v4 signatures.
• Dependency Updates: Updates go.mod and go.sum to include the AWS SDK for Go v2.

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[gemini-code-assist]

Code Review

This pull request introduces comprehensive support for various AWS authentication methods, including access keys, IAM roles, and web identity. The implementation includes credential caching and request signing. The code is well-structured with dedicated files for configuration, credentials implementation, and a factory.

My review focuses on improving correctness and maintainability. Key suggestions include:

• Fixing a bug where the process credential provider's timeout is ignored.
• Improving the robustness of AWS service name extraction for request signing.
• Refactoring configuration parsing to be less error-prone.