Update react-native example to enable testing on a device.

[cjcenizal]

@twitchard I ran into a few issues running the react-native example on my device, so I'm updating the example with 3 specific changes I had to make to enable this.

Errors I encountered

TypeError: os.availableParallelism is not a function

This error occurred because I was on an older version of node. I added a note that Node 18.14 or greater is required.

Failed to build iOS project. We ran "xcodebuild" command but it exited with error code 65

This occurred because the signing certificate was missing. I added instructions on how to obtain a signing certificate through XCode based on the Expo docs.

error: Build input file cannot be found

Complete error:

error: Build input file cannot be found: '/hume-api-examples/evi-react-native-example/node_modules/react-native/React/Fabric/RCTThirdPartyFabricComponentsProvider.mm'. Did you forget to declare this file as an output of a script phase or custom build rule which produces it? (in target 'React-RCTFabric' from project 'Pods')

The solution to this was to upgrade react-native to a newer version.