Add SSO auth token implementation

[bluepal-prasanthi-moparthi]

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[Copilot]

Pull Request Overview

This PR adds SSO (Single Sign-On) authentication support to the v2 connection package by implementing token-based authentication with automatic token refresh and SSO redirect handling.

• Refactored existing JWT authentication to support token caching and automatic refresh based on expiry
• Added new NewSSOAuthWrapper function for SSO authentication flows with redirect handling
• Implemented JWT token parsing to extract expiration times for proper token lifecycle management

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
v2/connection/auth_jwt_impl.go	Added SSO auth wrapper, JWT token parsing, and refactored existing JWT auth to support token caching and refresh
v2/CHANGELOG.md	Added changelog entry for the new SSO auth token implementation

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