oci-mcp-common v0.1.0 library with auth module

[dustin-sale]

Description

Adds oci-mcp-common v0.1.0, a shared OCI SDK authentication library for MCP servers. It supports API-key and session-token profiles, Identity Domains UPST exchange, instance/resource principals, delegation tokens, and OKE workload identity.
This centralizes credential resolution while leaving individual servers responsible for client configuration, user agents, and lifecycle. Dependencies: Python 3.13+ and OCI Python SDK 2.179.0+.

Addresses #366

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

• make test project=oci-mcp-common — 36 tests passed; 96.35% coverage.
• make lint — Ruff completed with no findings.

Test Configuration:

• Firmware version: N/A
• Hardware: macOS (Darwin)
• Toolchain: Python 3.13.13, pytest 9.1.1
• SDK: OCI Python SDK 2.182.0

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules