Dot notation, readthedocs, query validation

[ivana-truong]

• Added query validation through graphql-core package
• Query must be executed using '.exec()'
• Package is initialized with __init__.py
• Dot notation is supported
  • allows you to specify a full query path
  • throws error if there are other paths of equal length and includes warning that list may not be complete
• readthedocs created and Google Colab links for notebooks added
• If fails to fetch schema online, fall back on local file.
  • schema version checking test added
  • add all schema files on https://data.rcsb.org/#data-schema
• query_construction changed to use simple_paths not shortest_paths
  • in the case of loops or paths not on the simple_paths list, separately resolve the dot path into indices. Then find the shortest path from the input_type index to the beginning of given dot path and make into a full path.
  • simulated weighing of assembly edges by removing paths that are equivalent to other paths, but go through "assemblies"
• change find_field_names to return only matching field names (no description)
  • delete field_description_dict
• update tests and examples to work with changes
• update documentation to match changes
• more typing and docstrings

[piehld]

Thank you!