feat(@schematics/angular): change layout for root applications

[alan-agius4]

This change aligns the file layout of applications generated with ng new and ng generate

[alan-agius4]

Block until #13797, #13780 and #13777 get merged

[clydin]

I think both the app tsconfig and the spec tsconfig should always be under src. Every path is prefixed with src and they are only relevant to the files within src.

Otherwise, looks good.

[alan-agius4]

@clydin at the moment, all schematics apart from ng new generate tsconfigs outside of the src folder.

Example:

• ng g lib
• ng g app
• ng g e2e

Does this mean that all these schematics should be changed to have all structures conforming with each other?

This task is to align the file structure of ng g new with that of ng g app.

At the moment, this is the ng g app layout is as follows;

[clydin]

Let's leave the tsconfig locations out of this PR and address it moving forward.

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