[oep] add multi cloud support proposal

[slin1237]

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[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 proposal (OEP) for adding multi-cloud support to OME. It outlines the motivation, goals, design details, and implementation plan for enabling OME to work with multiple cloud providers, including authentication and storage. The proposal aims to create a more flexible and adaptable architecture for OME.

Highlights

• Multi-Cloud Support: This OEP proposes a multi-cloud architecture for OME, providing unified interfaces for authentication and storage operations across major cloud providers (OCI, AWS, GCP, Azure, GitHub).
• Provider-Agnostic Interfaces: The design replaces existing OCI-specific implementations with provider-agnostic interfaces for authentication (pkg/auth) and storage (pkg/storage).
• URI Specification: Introduces a consistent URI scheme across all providers (e.g., s3://bucket/object, gs://bucket/object).
• Extensible Design: Implements an extensible factory pattern for easy registration of new providers without modifying core code.

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Code Review

OEP-0002 introduces a multi-cloud storage and authentication proposal. The design is comprehensive, covering key aspects like motivation, architecture, and risks. The URI format should be more flexible, and the creation date in oep.yaml needs correction.