[msal-node-extensions] Introducing KeyRingPersistence which uses @napi-rs/keyring and provides cross platform secure store operations

[altinokdarici]

This pull request introduces several changes to the msal-node-extensions package, focusing on updating dependencies, improving platform support, and deprecating old persistence classes in favor of a new implementation. The most important changes include the introduction of KeyRingPersistence, updates to the rollup.config.js file, and modifications to the documentation to reflect these changes.

New Persistence Implementation:

• Added KeyRingPersistence class to handle secure storage across multiple platforms using the @napi-rs/keyring library. This class replaces the need for platform-specific persistence classes.

Dependency Updates:

• Updated package.json to replace the keytar dependency with @napi-rs/keyring and added @rollup/plugin-commonjs.

Build Configuration:

• Updated rollup.config.js to include @rollup/plugin-commonjs and exclude native dependencies from the bundle. [1] [2] [3] [4] [5]

Deprecation of Old Classes:

• Deprecated KeychainPersistence and LibSecretPersistence classes in favor of the new KeyRingPersistence class. [1] [2]

Documentation Updates:

• Updated msal-node-extensions.md to reflect the new KeyRingPersistence class and removed the old platform-specific persistence examples. [1] [2]