fix typo in clientEngine option

[raju-opti]

Issues

• [BUG] Wrong client engine for node #1089

[Copilot]

Pull Request Overview

This PR fixes a typo in the Node.js implementation where clientEnging was misspelled instead of clientEngine, and adds proper TypeScript typing by importing and using the OptimizelyFactoryConfig type.

• Fixed typo: clientEnging → clientEngine in the Node.js configuration
• Added proper TypeScript typing for configuration objects in both React Native and Node.js implementations
• Imported OptimizelyFactoryConfig type to ensure type safety

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
lib/index.react_native.ts	Added OptimizelyFactoryConfig import and type annotation for rnConfig
lib/index.node.ts	Added OptimizelyFactoryConfig import, type annotation for nodeConfig, and fixed clientEnging typo

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[coveralls]

coverage: 78.76%. remained the same
when pulling 78c8ce6 on raju/typo_fix
into 99a4ca7 on master.