Add package.json to the exports

[f8k8]

Summary

The React Native build tools search through all dependencies and parse the package.json from each. When the package.json is not included in a dependencies exports, the build fails, and so currently svgr/webpack cannot be used with React Native.
There's thread with a feature request for Node to have special treatment for package.json, but the Node team have stated this isn't likely to happen: nodejs/node#33460
There's an open PR for the React Native tools to add an attempt at a fallback to deal with this, but it's more of a workaround than an actual fix: react-native-community/cli#1648
The actual fix requires any used dependencies to either exclude the exports section in their package.json, or to list the package.json as an export. This also fixes #742

Test plan

• Build the project (npm run build).
• Include the project as a dependency in another project.
• Require the package.json: require("@svgr/webpack/package.json");

Without explicitly specifying the package.json in the exports, the require fails with: Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './package.json' is not defined by "exports".

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Name	Status	Preview	Updated
svgr	✅ Ready (Inspect)	Visit Preview	Jul 15, 2022 at 9:10PM (UTC)