Add ESM export

[DanielleHuisman]

Vite 5 prints warnings for any plugins still using CJS imports. This PR adds an ESM export, which resolves the warning.

Trace: The CJS build of Vite's Node API is deprecated. See https://vitejs.dev/guide/troubleshooting.html#vite-cjs-node-api-deprecated for more details.
    at warnCjsUsage (/redacted/node_modules/vite/index.cjs:32:3)
    at Object.<anonymous> (/redacted/node_modules/vite/index.cjs:3:1)
    at Module._compile (node:internal/modules/cjs/loader:1241:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1295:10)
    at Module.load (node:internal/modules/cjs/loader:1091:32)
    at Module._load (node:internal/modules/cjs/loader:938:12)
    at Module.require (node:internal/modules/cjs/loader:1115:19)
    at require (node:internal/modules/helpers:130:18)
    at Object.<anonymous> (/redacted/node_modules/vite-plugin-graphql-codegen/dist/index.js:29:20)
    at Module._compile (node:internal/modules/cjs/loader:1241:14)

[danielwaltz]

Thanks for this! I saw the warnings but wasn't quite sure what the reason was. This looks good, but it does need to use the conventional commits format in order for CI to detect this as a change to release.

I would say just updating the commit message to fix: support esm would be perfect! I can also take this change and release it myself marking you as a co-contributor if you would prefer.

[DanielleHuisman]

I updated the commit message.

[github-actions]

🎉 This PR is included in version 3.3.4 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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