PLT-6741 - Initial version of workspaces

[hrajchert]

This PR separates the SDK into different packages using npm workspaces. Three things needs to work together for this to be successful

• Package management:
  • The different packages needs to be maintained by a tool, in this case npm workspaces and the way the packages are linked should be coherent both in runtime and type level
• TypeScript references:
  • The tsconfig use project reference and path aliases to correctly solve package linking
• Runtime environment
  • This should be loadable both in Node.js and in the browser.

To test module resolve in the Node.js first build the project and then run

$ node test-nodejs-import.mjs 

To test module resolve in the browser, build the project and

# Serve the contents of the root folder
$ npx http-serve
# In the browser go to http://127.0.0.1:8080/web-rollup-esm-poc.html and inspect the console

The unit tests of the language module can be runned using

$ npm t

either in the root directory or in the proper package.

The e2e tests are not running because some issues with ts-jest
TODO: Compile and run tests