Introduce client_credentials grant support in ThunderID Node.js SDK

[brionmario]

Purpose

• Added AuthService and InventoryService for machine-to-machine authentication.
• Implemented client_credentials flow in the Node.js quickstart sample.
• Updated environment variable handling in quickstart samples.
• Enhanced UI for configuration prompts and inventory display.
• Added .env.example for environment variable setup in Node.js quickstart.
• Updated package.json scripts to use --env-file-if-exists for better handling of environment variables.

Approach

Related Issues

• Quickstart Sample: Getting Started with @thunderid/node thunderid#3587

Related PRs

• N/A

Checklist

• Followed the contribution guidelines.
• Manual test round performed and verified.
• Documentation provided. (Add links if there are any)
• Tests provided. (Add links if there are any)
  • Unit Tests
  • Integration Tests
• Breaking changes. (Fill if applicable)
  • Breaking changes section filled.
  • breaking change label added.

Security checks

• Followed secure coding standards in WSO2 Secure Coding Guidelines
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets.

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Review details

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📥 Commits

Reviewing files that changed from the base of the PR and between a02382f and b59aa83.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (13)

• packages/javascript/src/ThunderIDJavaScriptClient.ts
• packages/javascript/src/constants/TokenConstants.ts
• packages/javascript/src/models/config.ts
• samples/express/quickstart/index.mjs
• samples/express/quickstart/package.json
• samples/express/quickstart/public/styles.css
• samples/node/quickstart/.env.example
• samples/node/quickstart/README.md
• samples/node/quickstart/index.mjs
• samples/node/quickstart/lib/AuthService.mjs
• samples/node/quickstart/lib/InventoryService.mjs
• samples/node/quickstart/lib/ui.mjs
• samples/node/quickstart/package.json

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🧪 Generate unit tests (beta)

• Create PR with unit tests

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