Pdm-build-locked

- fixed a bug where no locked group would be published by the CLI plugin if `[project.optional-dependencies]` was not set and `pdm-build-locked` was not specified under `[build-system.requires]`. Adding `pdm-build-locked` to `[build-system.requires]` is explicitly not required if only the CLI plugin is used (13)

- fixed a bug where `pdm build --locked` would fail for projects with `dynamic = ["optional-dependencies"]` and `dependencies = []` in `pyproject.toml`

- the backend plugin now accepts empty dependency groups

- added backend plugins for `hatchling` and `pdm`
- compatibility with `pdm` 2.11.0

- fixed sending requests to remote repository for resolution - only lockfile is used now
- improved logging output