Add subscriptSizing support for Material FormField

[craigsh]

Is your feature request related to a problem? Please describe.

Material v15 has a subscriptSizing input on FormField which can be 'fixed' or 'dynamic'. As Formly provides a default form-field wrapper, it would be good to be able to set this input to dynamic for my project.

Describe the solution you'd like
Add a property to the form-field wrapper.

[dc-p8]

+1

As a workaround, if you always want fixed or dynamic, you can use the MAT_FORM_FIELD_DEFAULT_OPTIONS injection token to set the default value of subscriptSizing

[aitboudad]

This issue has been fixed and released as part of v6.1.1 release.

Please let us know, in case you are still encountering a similar issue/problem.
Thank you!