feat: added support for multi-project setups

[Vo1dSh4d0w]

Hello,

these changes allow multi-project setups to be compiled using cds-typer. We need this change, because our project structure does not exactly match the structure in our target directory (gen), therefore we have a tsconfig each for our 2 separated projects.

With these changes, in order to build 2 projects, the build defintion has to be modified manually, for example:

  "build": {
    "target": "gen",
    "tasks": [
      {
        "for": "hana",
        "src": "db"
      },
      {
        "for": "nodejs",
        "src": "srv"
      },
      {
        "for": "mtx-sidecar",
        "src": "mtx/sidecar"
      },
      { "for": "typescript" },
      { "for": "typescript", "src": "mtx/sidecar", "dest": "mtx/sidecar" }
    ]
  }

This change works by joining every project related path (like tsconfig.cdsbuild.json) with the configured "src", I've also added a check to the configured "dest", which ensures that a custom "dest" won't be overwritten in the "init()" function.

I've tested this patch both with our real project and with a smaller project without any explicit build configuration.

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[daogrady]

Hi Filip,

thanks for pointing this scenario out and for providing a fix.
The change looks good on first glance, please just address the failing workflows.

Also, could you please let me know why your projects need differing layouts? This is a use case we have not yet encountered.

Best,
Daniel