Docs and Python package builds are not self-contained

[mfisher87]

Can't build docs without running jlpm build at the repo root first (which requires a dev environment). The docs instructions are updated in #584 to reflect this. Can we make the docs environment self-contained by somehow configuring the Python packages' pyproject.toml to require the Javascript packages be built first?

Original bug report before fixing up #584

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The Python API docs are not rendered, and a warning occurs in the logs. This is because jupytergis_lab is not installed. When adding jupytergis_lab to environment-docs.yml like so:

  - pip:
      # Install JupyterGIS so we can autodoc:
      - ../python/jupytergis_core
      - ../python/jupytergis_lab

The build fully fails with:

      INFO:hatch_jupyter_builder.utils:> /tmp/pip-build-env-ibp_gqrb/overlay/bin/jlpm run build:prod                                                                                           
      src/externalcommand.ts(4,8): error TS2307: Cannot find module '@jupytergis/schema' or its corresponding type declarations.                                                               
      src/factory.ts(7,8): error TS2307: Cannot find module '@jupytergis/schema' or its corresponding type declarations.                                                                       
      src/factory.ts(17,8): error TS2307: Cannot find module '@jupytergis/base' or its corresponding type declarations.                                                                        
      src/jgisplugin/modelfactory.ts(5,8): error TS2307: Cannot find module '@jupytergis/schema' or its corresponding type declarations.
      src/jgisplugin/plugins.ts(13,8): error TS2307: Cannot find module '@jupytergis/schema' or its corresponding type declarations.
      src/jgisplugin/plugins.ts(30,52): error TS2307: Cannot find module '@jupytergis/base' or its corresponding type declarations.
      src/jgisplugin/plugins.ts(56,12): error TS2339: Property 'jupytergisMaps' does not exist on type 'Window & typeof globalThis'.
      src/jgisplugin/plugins.ts(126,39): error TS2345: Argument of type 'unknown' is not assignable to parameter of type 'string'.
      src/jgisplugin/plugins.ts(127,47): error TS2345: Argument of type 'unknown' is not assignable to parameter of type 'string | undefined'.
      src/layerBrowserRegistry.ts(4,8): error TS2307: Cannot find module '@jupytergis/schema' or its corresponding type declarations.
      src/plugin.ts(1,33): error TS2307: Cannot find module '@jupytergis/base' or its corresponding type declarations.
      src/plugin.ts(14,8): error TS2307: Cannot find module '@jupytergis/schema' or its corresponding type declarations.
      src/plugin.ts(100,37): error TS7006: Parameter '_' implicitly has an 'any' type.
      src/plugin.ts(100,40): error TS7006: Parameter 'changed' implicitly has an 'any' type.
      src/schemaregistry.ts(1,48): error TS2307: Cannot find module '@jupytergis/schema' or its corresponding type declarations.
      src/schemaregistry.ts(2,24): error TS2307: Cannot find module '@jupytergis/schema/lib/_interface/forms.json' or its corresponding type declarations.

Fixing this should enable us to simplify the ReadTheDocs build (#441).

[mfisher87]

This can be fixed by first running jlpm build in the root of the repo. How can we encode that dependency in the pyproject.toml for jupytergis_lab & jupytergis_core so that they properly build when specified as above in environment-docs.yml? They should ideally be self-contained. @arjxn-py @martinRenou could use your input on this :)