feat(angular, react, vue, core): export openURL utility (#28295)

Issue number: resolves #27911 

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## What is the current behavior?
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The `openURL` utility is not available to developers. 

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

- Export `openURL` utilities from `@ionic/core`, `@ionic/angular`,
`@ionic/react` and `@ionic/vue`.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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and migration path for existing applications below. -->


## Other information

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