Add schematics for creating component harness

[KevinVillela]

🚀 Feature request

Command (mark with an x)

• new
• build
• serve
• test
• e2e
• 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]

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[angular-robot]

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