* add arrow storage

* use two different methods for info/spaces

* fix info shape

* add deps

* fix pre-commit

* fix None seed

* fix docs

* fix minari show

* fix docs

* remove max_buffer steps

* add EpisodeBuffer utility

* fix tests

* fix docs

* add docstring

* fix h5py storage

* reformat

* test both storages

* improve tests

* reformat

* use arrow instead of parquet

* change default to hdf5

* refactor data_collector

* add typing to EpisodeBuffer

* address comments

* add data_format to tests

* fix dataset combine test

* improve arrow efficiency