ApplicationBase support time zone on IntlProvider

[nickpith]

Feature Request

Description

We don't have a lot of guidance on date/time formatting. Ideally, I would like applications to use react-intl's FormattedDate component and methods to format date/times. This works well until you want to display times in a time zone other than the browser/system's default time zone. HealtheIntent allows tenants to specify a time zone for their applications to display date/times in.

It seems that IntlProvider has a timeZone prop that can be used. However, I don't believe we can specify it in ApplicationBase. I would like an application to specify the time zone once like locale and then have react-intl use that time zone. I think it is just adding an additional prop for time zone and passing it to IntlProvider.

Additional Context / Screenshots

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