Covalent

Added

- Transportable object tests
- Transport graph tests

Changed

- Variable name node_num to node_id
- Variable name node_idx to node_id

Fixed

- Transport graph `get_dependencies()` method return type was changed from Dict to List

Fixed

- Date handling in changelog validation

Removed

- GitLab CI YAML

Added

- A new parameter to a node's result called `sublattice_result` is added.
This will be of a `Result` type and will contain the result of that sublattice's
execution. If a normal electron is executed, this will be `None`.

- In `_delete_result` function in `results_manager.py`, an empty results directory
will now be deleted.

- Name of a sublattice node will also contain `(sublattice)`.

- Added `_dispatch_sync_serverless` which synchronously dispatches without a server
and waits for a result to be returned. This is the method used to dispatch a sublattice.

- Test for sublatticing is added.

- How-to guide added for sublatticing explaining the new features.

Changed

- Partially changed `draw` function in `lattice.py` to also draw the subgraph
of the sublattice when drawing the main graph of the lattice. The change is
incomplete as we intend to add this feature later.

- Instead of returning `plt`, `draw` now returns the `ax` object.

- `__call__` function in `lattice.py` now runs the lattice's function normally
instead of dispatching it.

- `_run_task` function now checks whether current node is a sublattice and acts
accordingly.

Fixed

- Unnecessary lines to rename the node's name in `covalent_dispatcher/_core/__init__.py` are removed.

- `test_electron_takes_nested_iterables` test was being ignored due to a spelling mistake. Fixed and
modified to follow the new pattern.

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