Update setup.py for setuptools 69

[aljazerzen]

Move fields from setup.py into pyproject.toml.

This is required because setuptools version 69 is reporting the following error:

➜  parsing git:(main) ✗ pip install .
Processing /home/aljaz/EdgeDB/parsing
  Installing build dependencies ... done
  Getting requirements to build wheel ... error
  error: subprocess-exited-with-error
  
  × Getting requirements to build wheel did not run successfully.
  │ exit code: 1
  ╰─> [57 lines of output]
      /tmp/pip-build-env-l5q640ua/overlay/lib/python3.11/site-packages/setuptools/config/_apply_pyprojecttoml.py:75: _MissingDynamic: `optional-dependencies` defined outside of `pyproject.toml` is ignored.
      !!
      
              ********************************************************************************
              The following seems to be defined outside of `pyproject.toml`:
      
              `optional-dependencies = {'test': ['flake8', 'mypy>=1.4.1']}`
      
              According to the spec (see the link below), however, setuptools CANNOT
              consider this value unless `optional-dependencies` is listed as `dynamic`.
      
              https://packaging.python.org/en/latest/specifications/declaring-project-metadata/
      
              To prevent this problem, you can list `optional-dependencies` under `dynamic` or alternatively
              remove the `[project]` table from your file and rely entirely on other means of
              configuration.
              ********************************************************************************
      
      !!