Add OCI plugin with API key support and CLI configurations

[felipebz]

Overview

This PR introduces a new shell plugin for the Oracle Cloud Infrastructure CLI (oci).

It securely provisions the necessary authentication details in memory using OCI CLI's native environment variables (OCI_CLI_USER, OCI_CLI_TENANCY, OCI_CLI_FINGERPRINT, OCI_CLI_REGION, and OCI_CLI_KEY_CONTENT).

Additionally, this implementation includes a robust importer that handles real-world OCI configurations (addressing the architectural limitations of the previous attempt in #401). The importer:

• Correctly parses the standard ~/.oci/config as an INI file.
• Dynamically iterates over all configured profiles (not just the DEFAULT section).
• Properly resolves the key_file path, safely expanding ~/ to the user's home directory.
• Reads the local private key content to allow seamless importation of existing local configurations straight into the 1Password vault.

Type of change

• Created a new plugin
• Improved an existing plugin
• Fixed a bug in an existing plugin
• Improved contributor utilities or experience

Related Issue(s)

• Resolves: New plugin: oci cli (Oracle Cloud Infrastructure) #132
• Relates: experimentation oci cli #401

How To Test

1. Compile the plugin locally: make oci/build
2. Run an OCI command to trigger the importer (assuming you have a valid ~/.oci/config and .pem key file on your machine):
   oci iam region list
3. Follow the prompt to import the discovered credentials into your 1Password vault.
4. Run another authenticated command to verify the in-memory credential provisioning is working correctly:
   oci os ns get or oci iam region list

Changelog

Authenticate the Oracle Cloud Infrastructure CLI (oci) with 1Password Shell Plugins.