Ensure correct measurements when trimming transactions

[krystofwoldrich]

Description

• Backlink Ensure correct measurements when trimming transactions team-mobile#107

We would need to change how we collect the frames from native SDKs.
We will need to fetch the data every time we kick the idle timeout so we are able to use them after we trim the transaction.

Related code

sentry-react-native/android/src/main/java/io/sentry/react/RNSentryModuleImpl.java

Line 281 in 850e1e5

public void fetchNativeFrames(Promise promise) {

sentry-react-native/ios/RNSentry.mm

Line 253 in 9299258

RCT_EXPORT_METHOD(fetchNativeFrames:(RCTPromiseResolveBlock)resolve