Feature/types

[brianignacio5]

This PR re writes the ESPTOOL-JS in TypeScript and preparation for NPM packaging and publishing.

Proposed features here:

• Re write existing code in TypeScript and add types for targets and methods used.
• Re write example index.js for applied changes.
• Add Github CI for publishing in NPM.
• Add scripts for lint the existing typescript code.
• Add rollup script to bundle the resulting JS (after npm run build) into a single bundle.js used in the example for browser purposes.
• Removed XTerm within ESPLoader code and opted for dependency injection of Terminal reference. This allows the existing code to use different terminals systems in JavaScript/Typescript.
• Added package.json references and compilation from TypeScript to JavaScript so EsptoolJS could be used as a Node module with type references.

Things left out:

• Testing (How should we provide mocking for the Transport class to test ESPLoader functionality ?
• NPM account configuration to publish.

[balloob]

You can delete webserial.js