Add KeyboardAvoidingView to SurveyModal

[ian-craig]

Pulling over a couple of bug fixes from my fork:

• When focusing a text field in a popover/modal survey the keyboard would cover the modal so you couldn't see what you were typing
• The useFeedbackSurvey hook was returning surveys which were not launched/enabled in PostHog

#110

[greptile-apps]

PR Summary

This PR addresses keyboard interaction and survey filtering issues in the React Native survey implementation, focusing on modal visibility and survey activation state.

• Added KeyboardAvoidingView in /posthog-react-native/src/surveys/components/SurveyModal.tsx to prevent keyboard from obscuring text input fields
• Modified useFeedbackSurvey hook in /posthog-react-native/src/surveys/PostHogSurveyProvider.tsx to filter for active surveys using start_date and end_date checks
• Adjusted modal layout with proper margin handling between backdrop and content for better keyboard interaction
• Improved survey visibility by using statusBarTranslucent={true} for full-screen modal display

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[greptile-apps]

style: Consider platform-specific behavior - Android may need 'height' instead of 'padding'

Suggested change

	<KeyboardAvoidingView behavior={'padding'} style={{ marginBottom: insets.bottom + 10, marginHorizontal: 10 }}>
	<KeyboardAvoidingView behavior={Platform.OS === 'ios' ? 'padding' : 'height'} style={{ marginBottom: insets.bottom + 10, marginHorizontal: 10 }}>

[marandaneto]

I think we should call getActiveMatchingSurveys instead, passing context?.surveys.
Since the survey should only be shown in certain conditions, and this is a subset of it but, everything should apply right, even if you call useFeedbackSurvey yourself.