Itemize sanity checks

[mina-skunk]

Feature Description

Change type that MATERIAL_SANITY_CHECKS provides from boolean to:

interface SanityChecks {
  doctype: boolean;
  theme: boolean;
  version: boolean;
  hammer: boolean;
}

or even type boolean | SanityChecks for backwards compat

Use Case

We dynamically add the theme scss based on the user, this causes the warning

components/src/material/core/common-behaviors/common-module.ts

Lines 105 to 109 in 7f74211

	console.warn(
	'Could not find Angular Material core theme. Most Material ' +
	'components may not work as expected. For more info refer ' +
	'to the theming guide: https://material.angular.io/guide/theming'
	);

because the theme is not loaded yet when this code runs. Currently, to disable the warning we:

{ 
  provide: MATERIAL_SANITY_CHECKS, 
  useValue: false 
}

although the other checks could still be useful, if you could do

{ 
  provide: MATERIAL_SANITY_CHECKS, 
  useValue: {
    doctype: true,
    theme: false,
    version: true,
    hammer: true
  }
}

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