add uv_sync_groups and uv_sync_only_groups

[resulal]

What's the problem this feature will solve?

When using uv-venv-lock-runner with a uv.lock file, there is no option to specify the new dependency-groups, except with_dev boolean.

uv has already implemented --group and --only-group options to uv sync, where the latter also omits the project itself. Both options can be called multiple times.

Describe the solution you'd like

Similar to uv_sync_flags and extras, one can imagine specifying the dependency-groups as:

uv_sync_only_groups = 
  docs

where the following table exists in pyproject.toml file.

[dependency-groups]
docs = [
  "mkdocs>=1.6.0",
]

This way the uv.lock file can be used across multiple target tox run environments with the fast uv-venv-lock-runner runner.

[gaborbernat]

You can patch those flags directly via the configuration you mentioned. We don't actually need to expose it at a separate configuration.