Fix node SDK build error

[DonOmalVindula]

Purpose

This pull request addresses a node build error in the @asgardeo/node package by making minor refactoring changes to how internal properties are accessed in the legacy client and authentication core classes.

Code refactoring to fix build error:

• Updated property access from _authCore to authCore in the decodeJwtToken method of AsgardeoNodeClient in client.ts.
• Updated property access from _auth to auth in the decodeJwtToken method of AsgardeoNodeCore in authentication.ts.

Other:

• Added a changeset file documenting the patch and the build error fix for @asgardeo/node.

Related Issues

• N/A

Related PRs

• N/A

Checklist

• Followed the CONTRIBUTING guidelines.
• Manual test round performed and verified.
• Documentation provided. (Add links if there are any)
• Unit tests provided. (Add links if there are any)

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines?
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets?

[asgardeo-github-bot]

🦋 Changeset detected

The changes in this PR will be included in the next version bump.

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