Add schematics for creating component harness

[KevinVillela]

🚀 Feature request

Command (mark with an x)

• [ ] new
• [ ] build
• [ ] serve
• [ ] test
• [ ] e2e
• [x] generate
• [ ] add
• [ ] update
• [ ] lint
• [ ] xi18n
• [ ] run
• [ ] config
• [ ] help
• [ ] version
• [ ] doc

Description

Add the ability to create a Component Harness along with a new component, or add a Component Harness to an existing component.

Describe the solution you'd like

Describe alternatives you've considered

[alan-agius4]

I think this is more of a Material feature requests, since Component harness is part of Angular Material.

[angular-robot[bot]]

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[angular-robot[bot]]

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