Add NearestNeighbors SPMD API

[ethanglaser]

Description

Adds spmd NearestNeighbors to API with necessary modifications to sklearnex/spmd and onedal/spmd, along with minor revisions in onedal4py and onedal itself (uxlfoundation/oneDAL#3262 - which is prerequisite for merging this). Test also added for validation.

PR completeness and readability

• I have reviewed my changes thoroughly before submitting this pull request.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation to reflect the changes or created a separate PR with update and provided its number in the description, if necessary.
• Git commit message contains an appropriate signed-off-by string (see CONTRIBUTING.md for details).
• I have added a respective label(s) to PR if I have a permission for that.
• I have resolved any merge conflicts that might occur with the base branch.

Testing

• I have run it locally and tested the changes extensively.
• All CI jobs are green or I have provided justification why they aren't.
• I have extended testing suite if new functionality was introduced in this PR.

Performance

• I have measured performance for affected algorithms using scikit-learn_bench and provided at least summary table with measured data, if performance change is expected.
• I have provided justification why performance has changed or why changes are not expected.
• I have provided justification why quality metrics have changed or why changes are not expected.
• I have extended benchmarking suite and provided corresponding scikit-learn_bench PR if new measurable functionality was introduced in this PR.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
onedal/spmd/neighbors/neighbors.py	66.66%	2 Missing and 2 partials ⚠️

Flag	Coverage Δ
azure	80.05% <75.00%> (+0.12%)	⬆️
github	71.62% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
onedal/neighbors/neighbors.py	81.20% <100.00%> (ø)
onedal/spmd/neighbors/__init__.py	100.00% <100.00%> (ø)
onedal/spmd/neighbors/neighbors.py	61.66% <66.66%> (+1.25%)	⬆️

... and 7 files with indirect coverage changes

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[ethanglaser]

Combined CI: http://intel-ci.intel.com/f04c5cd4-6c88-f193-9c31-a4bf010d0e2d