fix: Initial Unreal 5 support

[crleona]

Summary

• compiles against the latest amplitude-ios sdk
• adds support for unreal 5

Events seem to track from macOS. The settings editor plugin may not be writing to the correct place, I've manually set the following in DefaultEngine.ini to get things working (though I suspect I am over-specifying):

[Analytics]
ProviderModuleName=Amplitude
AmplitudeApiKey= APIKEY

[AnalyticsDevelopment]
ProviderModuleName=Amplitude
AmplitudeApiKey= APIKEY

[AnalyticsDebug]
ProviderModuleName=Amplitude
AmplitudeApiKey= APIKEY

[AnalyticsTest]
ProviderModuleName=Amplitude
AmplitudeApiKey= APIKEY

[AnalyticsRelease]
ProviderModuleName=Amplitude
AmplitudeApiKey=APIKEY

Checklist

• Does your PR title have the correct title format?
• Does your PR have a breaking change?: yes, ue5 support