feat: Configure CI for npm package publishing

[lornakelly]

Description

Set up CI to publish the editor as an npm package.

Motivation

Enable a reliable and repeatable process for publishing the editor, making it available to external consumers.

Proposed Implementation

The TypeScript SDK can be used as a reference implementation https://github.com/serverlessworkflow/sdk-typescript

Definition of Done

• Implementation: Fully implemented according to the Serverless Workflow spec.
• Unit Tests: Comprehensive unit tests are included and passing.
• Integration Tests: Verified within the monorepo and target environments (Web/VS Code).
• Documentation: Updated README.md, ADRs, or official docs.
• Performance: No significant regression in editor responsiveness.
• Accessibility: UI changes comply with accessibility standards.