typescript project references + webpack via babel

Using babel-loader and not ts-loader. ts-loader has built-in support for project references.

Motivation

CRA issue #7807

Info

No typechecking via webpack plugin. fork-ts-checker-webpack-plugin doesn't support project refs yet #328.

use yarn typecheck that uses tsc under the hood.

The project includes 4 packages

• target1 - the package we build with webpack, that imports code from the other packages.
• common - the files layout is optimal for no-build editing experience. vscode knowns to pick the typescript sources. but has specific layout. can't have outdir
• utils - same as common, just to add another level of deps
• withdist - another approach, with caveats. mostly no no-build editing experience. but we can have outDir

Read packages/target1/src/index.ts for additional info