Rcsb-api

- Update how `dataclass` attributes are created in `const.py`

- Add missing dependency for building documentation
- Add docstrings

- Add `ALL_STRUCTURES` object, allowing Data API queries for all PDB structures and chemical components
- Add `progress_bar` and `batch_size` parameters to Data API package's `.exec`
- Add `group` function to Search API package to enforce nested grouping
- Update README with new citation information
- Update search schemas: 1.48.0 -> 1.49.0
- Update data schemas:
- entry schema 9.0.3 -> 9.0.4
- polymer_entity_instance schema 10.0.2 -> 10.0.3
- nonpolymer_entity_instance schema 10.0.0 -> 10.0.1

- Add import to `const.py` for compatibility with Python 3.8
- Update search schemas: 1.47.7 -> 1.48.0

- Release version 1.0.0 of package
- Update search schemas: 1.47.6 -> 1.47.7
- Update data schemas:
- entry schema 9.0.2 -> 9.0.3
- chem_comp schema 7.1.3 -> 7.1.4
- Update documentation

- Separate out package-wide settings into immutable constants (`const.py`) and configurable parameters (`config.py`)
- Renamed `rcsb_attributes` -> `search_attributes`
- Automatically capitalize input_ids
- Added `dev_tools` directory and updated `update_schema.py`
- Search API `chemical_schema` and `structure_schema` at v1.47.6
- Update documentation