Rl4co

Better training, Bug fixes, and more 🚀

- Better automatic training with DDP 87
- Bug Fix `RL4COTrainer`
- Avoid broadcasting error warning in critic baselines
- Fix rollout baseline bug
- New experiment config structure: interpolate with environment name (we won't need anymore to have separate folders for each environment name such as TSP, CVRP etc, simply use one config to rule them all!

Major release: refactoring of models, trainer and pipelines, and more! 🚀

- Refactored the old `task` class into a base class (`RL4COLitModule`) that is the base for RL algorithms (such as REINFORCE and PPO), following the discussion in 67
- New base class for construction methods: now encoder, decoder, policy, and model can be based on common parent classes to make implementation much more modular
- Added native loading from the checkpoint, which used to be buggy
- Nice new logo (we like it, but we are obviously biased, so feel free to give us your opinion ;) )
- Added mPDP environment (and added some WIP for EquityTransformer)
- New `RL4COTrainer` that automatically includes training tricks for RL
- Added Codecov coverage
- Better testing: now we thoroughly test most of the library, including training (the Hydra part as well!)
- Documentation overhaul: add Sphinx plugins for modularized, automatic docs
- ... and more!

Better handling of notebooks, refactoring, plots and more!

Changelog of this release:
- Add notebook with checkpointing, logging, testing and more and relative bugfixes + feats 83
- Refactor env embeddings into `init`, `context` and `dynamic`
- OP plotting
- PCTSP plotting
- Quickfix Lightning problem: https://github.com/Lightning-AI/lightning/pull/18022
- Quickfix docs
- Misc

**Full Changelog**: https://github.com/kaist-silab/rl4co/compare/v0.0.5...v0.0.6

Changelog

- Fix SDVRP dynamic embedding 82
- Add missing environments in testing
- Update quickstart notebook to be more informative
- Remove rendering titles to avoid cluttering
- Other minor misc. updates

Documentation, environment refactoring, SPCTSP and more!

- Add initial documentation on ReadTheDocs 80
- Major refactoring of environments: new subclasses (`get_action_mask`, `check_solution_validity`) and more modular operations such as `get_tour_length`, move the base class and utils under `common/`
- New SPCTSP environment
- Fix SDVRP, refactor as subclass of CVRP
- Fix OP with major refactoring; typos eltociear
- Add Slack chat links
- Add [paper link](https://arxiv.org/abs/2306.17100) and citation
- Move dev status to Beta (it was production stable - we wish it was! Perhaps in the future... 🤞🏼)
- Misc bug fixes

Bug Fixes and more!

Changelog:
- Solve 71 (`pip install` from PyPI now works!)
- Fix TSP rendering
- Add `pre-commit-config` (we will make a contribution guide in the near future)
- Linting action with Black+Ruff combo - handled by default by the pre-commit
- Add working Colab notebook with full training and testing of AM
- Add badges
- Misc