Sync Android SDK version constant

[dtroupe-plaid]

Summary

• Adds an Android RNPlaidLinkSdkVersion constant set to the React Native SDK package version.
• Updates the Android Expo module sdkVersion constant to return 13.0.0 instead of the native Android SDK version.
• Extends version sync tests so both iOS and Android constants must match package.json.

Validation

• npm test -- --coverage --no-watch --passWithNoTests
• cd example/android && ./gradlew testDebugUnitTest

[github-actions]

Coverage after merging codex/sync-android-sdk-version into develop-v13 will be

100.00%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src
ReactNativePlaidLinkSdkModule.ts	100%	100%	100%	100%
index.ts	100%	100%	100%	100%