[Feature Request] Fetch project metadata from user level `uv.toml` for `pyproject.toml`

[dpprdan]

In #7718 we discussed to fetch project metadata from user level uv.toml to in insert in pyproject.toml on uv init.

In particular the authors/maintainers, license and classifiers fields come to mind, but possibly others as well, maybe even something like the [build-system] table.

(Probably obvious, because configured over inferred, but authors from uv.toml should take precedence over --author-from git/#7756).