fix!: Correctly type user and group properties

[dustinbyrne]

💡 Motivation and Context

groupProperties is typed incorrectly in many cases.

This PR changes many instances of groupProperties: Map<String, String> to groupProperties: Map<String, Map<String, Any?>>

Similarly, many instances of userProperties have changed from Map<String, String> to Map<String, Any?> to match other SDKs.

This changes the shape of interfaces both in core and server-side libraries. This is a major version bump for both.

Resolves #310

💚 How did you test it?

Existing tests are updated

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.

[marandaneto]

will this break the public API if someone declare and pass a Map<String, String>? should we raise a major?

[dustinbyrne]

Yeah, this is technically a major version bump in both packages. Hopefully this should be the last for a while.

[marandaneto]

we prob should normalize all params with Any since non-serialized values can break serialization (confirm if GSON does this automatically?)

[dustinbyrne]

GSON should be able to do this automatically but I'll include a test to verify

[dustinbyrne]

886d3a2

Does this address your concerns? I'd started looking at normalizing into primitive JSON types, but it seems GSON's default behavior may suffice.

[marandaneto]

probably yes, we do this on iOS https://github.com/PostHog/posthog-ios/blob/ba5dd65d2341ab8ea1949f072594ef67c490af3a/PostHog/Utils/DictUtils.swift#L10
if GSON behaves the same way, we are good.
It's important that GSON either stringifies any non-serializable object or just does not set it, rather than failing the serialization.
I'd suggest using a different type of object, which is not serializable eg a Context, Activity, View classes in Android, I suspect it might break the serialization but i am not 100% sure

[github-actions]

	Fails
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## Next
- Correctly type user and group properties ([#312](https://github.com/PostHog/posthog-android/pull/312))

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