Use the "version" field in the OpenAPI doc as the version of the generated library

[emann]

Is your feature request related to a problem? Please describe.
The template for the pyproject.toml has the version hardcoded as 0.1.0, which causes conflicts if the generated library is uploaded to a package repository that doesn't allow duplicate uploads for the same version.

Describe the solution you'd like
The GeneratorData class already has the version stored, just need to store it and pass it to the call to pyproject_template.render in _Project._build_metadata