fixes: #118

This PR adds unit/e2e testing and @open-next packages for modular development and testing, but currently, open-next does not import the @open-next/utils package b/c doing so would change the dist output and I didn't want to deal w/ that yet.

You can test this locally by running: pnpm run dev to run the next apps and then pnpm run e2e:test
You can test against a deployed app by setting the proper env variable:

/examples/sst

export APP_DIR_ONLY_URL=$(jq -r '.["e2e-example-AppDirOnly"].url' .sst/outputs.json)
export PAGES_ONLY_URL=$(jq -r '.["e2e-example-PagesOnly"].url' .sst/outputs.json)
export APP_DIR_AND_PAGES_URL=$(jq -r '.["e2e-example-AppDirAndPages"].url' .sst/outputs.json)

The current Nextjs Version is 13.4.12 (last stable version). But once the open PRs are merged to address the issues, we'll want to set the version to latest

todo:

• Add AppDir + Pages project
• Add more scenarios

@fwang

• Add SST credentials to project for deployment
• Validate that the e2e.yml is properly configured