feat: add ESM support for generated project

[satya164]

This adds ESM support to the generated project. To do this:

• Use .cjs and .mjs file extensions for the generated files
• Add file extensions to imports in the compiled code
• Add the exports field in package.json
• Update the moduleResolution config to Bundler in tsconfig.json

In addition:

• Enable the new JSX runtime option for React
• Recommend removing the react-native field from package.json

This is a breaking change for library authors. After upgrading, it's necessary to update the configuration by running the following command:

yarn bob init

Alternatively, they can follow the manual configuration guide.

In addition, typescript consumers would need to change the following fields in tsconfig.json:

"jsx": "react-jsx",
"moduleResolution": "Bundler",

If using ESLint, it may also be necessary to disable the "react/react-in-jsx-scope" rule:

"react/react-in-jsx-scope": "off"