[client][iOS] Prebuild `react-native-safe-area-context` (#18679)

# Why

Prebuild the `react-native-safe-area-context` on iOS.
Part of ENG-5410.

# How

- Used a pre-building script.
- Create

[client][iOS] Prebuild `react-native-safe-area-context` (#18679)

# Why

Prebuild the `react-native-safe-area-context` on iOS.
Part of ENG-5410.

# How

- Used a pre-building script.
- Created a custom podspec uses to build vendored code.
- Adjusted vendored script.

# Test Plan

- run `et vendor -c "[dev-menu] safe-area-context"` ✅
- build bare-expo ✅

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