Sets the
<a href='https://developer.apple.com/library/archive/documentation/Security/Conceptual/CodeSigningGuide/Procedures/Procedures.html#//apple_ref/doc/uid/TP40005929-CH4-SW1'>code
signing identity</a> to use when signing code.

This is the same as setting `CODE_SIGN_IDENTITY` in Xcode.

<details>
<summary>History</summary>

- [[0.9.7](https://github.com/microsoft/react-native-test-app/releases/tag/0.9.7)]
  Added

</details>
