GLSP-1179 Switch to composite ts build

[tortmayr]

What it does

Switch to composite ts build
Part of eclipse-glsp/glsp/issues/1179

How to test

Follow-ups

Changelog

• This PR should be mentioned in the changelog
• This PR introduces a breaking change (if yes, provide more details below for the changelog and the migration guide)

[martin-fleck-at]

Code looks good to me and I think it works. However, I noticed that previously yarn build built the following projects:

    - workflow-vscode-example
    - workflow-vscode-example-web
    - workflow-glsp-webview
    - @eclipse-glsp/vscode-integration
    - @eclipse-glsp/vscode-integration-webview

Now it is just:

    - workflow-vscode-example
    - workflow-vscode-example-web
    - workflow-glsp-webview

Is that to be expected?

[tortmayr]

Code looks good to me and I think it works. However, I noticed that previously yarn build built the following projects:

    - workflow-vscode-example
    - workflow-vscode-example-web
    - workflow-glsp-webview
    - @eclipse-glsp/vscode-integration
    - @eclipse-glsp/vscode-integration-webview

Now it is just:

    - workflow-vscode-example
    - workflow-vscode-example-web
    - workflow-glsp-webview

Is that to be expected?

Yes that is expected. The output you described is from lerna when you are streaming commands
e.g: yarn lerna run clean. Since we have a composite build now we no longer use lerna run for
the tsc compilation. However, we still use it for the webpack bundle creation of the extensions:

 >  Lerna (powered by Nx)   Running target bundle for 3 projects:

    - workflow-vscode-example
    - workflow-vscode-example-web
    - workflow-glsp-webview

[martin-fleck-at]

Great, I am happy with the explanation! Let's get this merged!