Covalent

Added

- Electrons can now accept an executor object using the "backend" keyword argument. "backend" can still take a string naming the executor module.
- Electrons and lattices no longer have Slurm metadata associated with the executor, as that information should be contained in the executor object being used as an input argument.
- The "backend" keyword can still be a string specifying the executor module, but only if the executor doesn't need any metadata.
- Executor plugin classes are now directly available to covalent, eg: covalent.executor.LocalExecutor().

Added

- Docstrings without examples for all the functions in core covalent.
- Typehints in those functions as well.
- Used `typing.TYPE_CHECKING` to prevent cyclic imports when writing typehints.

Changed

- `convert_to_lattice_function` renamed to `convert_to_lattice_function_call`.
- Context managers now raise a `ValueError` instead of a generic `Exception`.

Fixed

- Fixed the version used in the documentation
- Fixed the badge URLs to prevent caching

Fixed

- Broken how-to links

Removed

- Redundant lines from .gitignore
- \*.ipynb from .gitignore

Added

- How-to guides for workflow orchestration.
- How to construct an electron
- How to construct a lattice
- How to add an electron to lattice
- How to visualize the lattice
- How to add constraints to lattices
- How-to guides for workflow and subtask execution.
- How to execute individual electrons
- How to execute a lattice
- How to execute multiple lattices
- How-to guides for status querying.
- How to query electron execution status
- How to query lattice execution status
- How to query lattice execution time
- How-to guides for results collection
- How to query electron execution results
- How to query lattice execution results
- How to query multiple lattice execution results
- Str method for the results object.

Fixed

- Saving the electron execution status when the subtask is running.

Removed

- JWT token requirement.
- Covalent dispatcher login requirement.
- Update covalent login reference in README.md.
- Changed the default dispatcher server port from 5000 to 47007.