Analytics | Add support for super properties and appPlatform

[BillCarsonFr]

Add support for posthog super properties (added to all events). The analytics-event dependency has been updated to latest release.

In order to add unit test I had to introduce a protocol interface for PostHog and added some Mock classes.

Fixes https://github.com/element-hq/crypto-internal/issues/322

Pull Request Checklist

• [ ] I read the contributing guide
• [ ] UI change has been tested on both light and dark themes, in portrait and landscape orientations and on iPhone and iPad simulators
• [ ] Accessibility has been taken into account.
• [ ] Pull request is based on the develop branch
• [ ] Pull request contains a changelog file in ./changelog.d
• [ ] You've made a self review of your PR
• [ ] Pull request includes screenshots or videos of UI changes
• [ ] Pull request includes a sign off

[sonarcloud[bot]]

Quality Gate passed

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