Configurable default value for fxLayoutGap & gdGap

Feature Request

What is the desired behavior?

Would be nice to implement configurable default gap for fxLayoutGap & gdGap directives.

import { FX_DEFAULT_GAP } from '@angular/flex-layout/flex';
import { GD_DEFAULT_GAP } from '@angular/flex-layout/grid';

@NgModule({
  providers: [
    { provide: FX_DEFAULT_GAP, useValue: '24px' },
    { provide: GD_DEFAULT_GAP, useValue: '24px' }
  ]
})

What is the use-case or motivation for the desired behavior?

It makes templates nice and clean + allows you to keep gutter sizes in one place.

[CaerusKaru]

Now that we’ve introduced StyleBuilders, it’s pretty seamless to override default styles. An example for how to do this has been added to the Wiki here. We won’t be providing tokens for each directive because that includes too much clutter in the library, whereas adding a StyleBuilder ad hoc is pretty straightforward.

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