feat: adds support for detecting NX monorepos

[Cephyric-gh]

Adds support for detecting NX monorepo structures, allows angular SSR detection to overwrite the generated server.ts and deploy appropriate edge functions for them.

It's not fully clean as it currently requires the ANGULAR_PROJECT environment variable to pick up the correct project.json. This could have much better DX if packagePath was exposed to the runtime, which as far as I could tell it is not passed through. When creating projects in a user's account it already automatically detects NX and asks for the project to prefill this value, so should be available.

Resolves #156

[pieh]

This could have much better DX if packagePath was exposed to the runtime, which as far as I could tell it is not passed through.

packagePath should be set under constants.PACKAGE_PATH (constants being passed to build step hooks in src/index.js) when monorepo scenarios are detected (or it will be undefined otherwise). We use that for example in https://github.com/opennextjs/opennextjs-netlify/blob/23b1f37ad2e7cc0afc7901937796ac87597ab6e1/src/build/plugin-context.ts#L217

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[pieh]

This is great, thanks!

Before merging - please let me know if you want to make additional changes (I don't see anything missing at this point) or if it's good to be merged from your perspective

[Cephyric-gh]

Nope, everything looks good from my end too!

[pieh]

This was released in 2.3.0 - https://github.com/netlify/angular-runtime/releases/tag/v2.3.0 and I also updated runtime auto-installation rules to use it automatically