feat(react-native): add <LDMask> and <LDUnmask> wrapper components

[beekld]

Summary

Implements <LDMask> and <LDUnmask> wrapper components for views. The names were chosen to be consistent with existing LD APIs in RN. The implementation piggybacks on the TestID implementation. While I considered other ways of implementing it (such as walking the tree and marking individual controls), this was the only design that didn't have a small window at render time where masked controls could be visible.

How did you test this change?

Added a new section to the example app to exercise the new features. Everything is correct on Android. On iOS, there is only the known issue that will have to be fixed in the iOS repo separately.

Are there any deployment considerations?

N/A

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Note

Medium Risk
Changes how masking configuration is sent to native by prepending internal testID sentinels, which could affect apps relying on maskTestIDs/unmaskTestIDs ordering or using the reserved IDs. It also introduces new privacy-related behavior that should be validated across platforms.

Overview
Adds new <LDMask> and <LDUnmask> wrapper components that mark a React Native subtree as explicitly masked/unmasked in session replay via reserved internal testID values.

Updates configureSessionReplay (and plugin registration) to always prepend those internal sentinel IDs to maskTestIDs/unmaskTestIDs before forwarding options to native, and extends tests, the example app, and the README with the new masking precedence rules and usage.

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