Add hideRequiredMarker to MatFormFieldDefaultOptions

[jermowery]

Feature Description

Please add an option to MatFormFieldDefaultOptions to hide the required marker on the field.
This will allow us to default all form fields to hide the required marker instead of specifying the hideRequiredMarker input on each one. Add the field to MatFormFieldDefaultOptions and default the value of the hideRequiredMarker input of MatFormField this this value (I think this is trivial)

Use Case

In our app our UX team wants all fields required by default, so the required marker is overkill. We have to specify hideRequiredMarker on every single usage of MatFormField which is tedious and becomes error prone. Add this feature would eliminate this issue for us.

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