fix(datepicker): support ng-model-options timezone w/ Moment

[Splaktar]

PR Checklist

Please check that your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added or this is not a bug fix / enhancement
• Docs have been added, updated, or were not required

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Enhancement
[ ] Documentation content changes
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

• 1.1.23 broke the MomentJS demos of the datepicker
• In 1.1.23, PR feat(calendar): support specifying timezone in ng-model-options #11906 implemented support in md-calendar for ng-model-options, but it isn't hooked up to the md-datepicker to pass in its ng-model-options to the associated `md-calendar (datepicker: md-calendar panel should respect ng-model-options #10598).

Issue Number:
Fixes #11945. Fixes #10598.

What is the new behavior?

• support ng-model-options timezone w/ Moment
• add demo for ng-model-options timezone support
• pass datepicker's ng-model-options on to its calendar
• fix case where datepicker's model is initially out of sync with the input value

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[mmalerba]

LGTM