Qcware

Separated fit and predict and added classifiers (QNearestCentroid, QNeighborsRegressor, QNeighborsClassifier, QMeans)

- Bumps python version to `3.9`
- Better type hints for configuration module

- Added `retrieve_parameters` method to `qcware.forge.api_calls`, along with an `async_` version, that allows users to fetch the parameters of a previous API call.
- We also removed the legacy `submit_` and `async_` calls (for the new `call.submit` and `call.async` versions).
- `distance_estimation` has changed to `qdist.`
- Updated parameters for `qdot` and `qdist`.
- `Constraints` added some new internal fields which will appear when serialized.
- `qdist`, `qdot`, and `loaders` added several new loader modes.

* Big news: Reorganization! Instead of `import qcware` do `from qcware import forge` and all API calls are under `forge` (`forge.optimize...`)
* Solve_binary now removed in favor of optimize_binary
* Functions `qaoa_expectation_value` and `qaoa_sample` added
* Many changes to `BinaryProblem`, `BinaryResults`, `PolynomialObjective` and other optimization types
* Enabled `brute_force_minimize`

Repaired a defect in detecting a returned error

- Deprecated solve_binary in favor of optimize_binary and new BinaryProblem and BinaryResult classes
- New format for all tasks, including task(), task.submit(), and task.call_async() for all API calls; old submit_ and async_ versions deprecated
- Various changes in serialization and API communication