Gluonts

Backporting fixes:
- Fix version cmdclass handling. 2735 by jaheba
- Remove usage of glide in tsf-reader. 2737 by jaheba
- Fix: use non-strict inequality in definition of coverage 2738 by lostella
- Update Available Models 2740 by abdulfatir
- Fix MXNet NOPScaler 2744 by abdulfatir
- Add scipy requirement 2745 by abdulfatir
- Fix dataset file discovery. 2777 by jaheba
- Fix pandas removed deprecations in tests 2778 by lostella
- Fix: Loading of nested paths in FileDataset. 2779 by jaheba
- Prophet: Pass 'item_id' and 'info' to forecast. 2780 by jaheba

Backporting fixes:
- Allow PyTorch 2.0 2724 by lostella
- Improve check for validation loop in lightning modules 2726 by lostella
- Update CP-Flow fork as extra dependency for MQF2 2727 by lostella
- Allow PyTorch Lightning 2.0 2728 by lostella
- Fix _version location for sdist. 2729 by jaheba
- Add warning for "object" features in PandasDataset 2731 by lostella
- Docs: Add extra requirements. 2732 by jaheba
- Fix validation loop check for Lightning modules 2733 by lostella

Backporting fixes:
- Fix ev.seasonal_error 2696 by lostella
- Docs: minor spelling fix 2701 by lostella
- Fix Pandas 2.0 compatibility issues 2710 by lostella
- Relax pandas requirement to include pandas 2.x. 2713 by jaheba
- Fix DistributionForecast failure on GPU 2714 by huibinshen

Backporting fixes:
- Delay instantiation of ScipyStudentT object 2660 by gorold
- Faster index building in PandasDataset 2663 by huibinshen
- Speed up PandasDataset.from_long_dataframe 2665 by lostella
- Fix r-forecast doc strings 2669 by abdulfatir
- Fix DateSplitter when split date is before start 2670 by gorold
- Remove creation of ragged sequences in MultivariateGrouper 2671 by abdulfatir

Backporting fixes:
- Fix PyTorch training loop 2643 by gorold
- Fix norm-freq to consider freq starts. 2645 by jaheba
- Fix call to extractall 2648 by lostella

Backporting fixes:
- Fix: torch PoissonOutput scaling 2619 by kashif
- Remove dataclasses requirement 2623 by lostella
- Fix installation docs, fix typos in docstrings 2625 by lostella