feat(datetime): formatOptions property for Datetime (#29065)

Issue number: Internal

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## What is the current behavior?
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The Datetime header, Datetime time button, and Datetime Button have
default date formatting that cannot be set by the developer.

## What is the new behavior?
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this PR. -->

- The developer can customize the date and time formatting for the
Datetime header and time button
- The developer can customize the date and time formatting for the
Datetime Button
- A warning will appear in the console if they try to provide a time
zone (the time zone will not get used)
- A warning will be logged if they do not include the date or time
object for formatOptions as needed for the presentation of the Datetime

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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## Other information

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screenshots of how the component looks before and after the change. -->

These changes have been reviewed in #29009 and #29059. This PR just adds
them to the feature branch now that the separate tickets are complete.

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Co-authored-by: ionitron <hi@ionicframework.com>
Co-authored-by: Liam DeBeasi <liamdebeasi@users.noreply.github.com>

packages/vue/src/proxies.ts

@@ -274,6 +274,7 @@ export const IonDatetime = /*@__PURE__*/ defineContainer<JSX.IonDatetime, JSX.Io
   'color',
   'name',
   'disabled',
+  'formatOptions',
   'readonly',
   'isDateEnabled',
   'min',