FIX-#6647: Added init file to make modin/experimental/sql/hdk/query.py part of modin package #13957

Job	Run time
lint (black and isort)	34s
lint (mypy)	2m 40s
lint (flake8)	22s
Test API, headers and no-engine mode	3m 24s
execution-filter	6s
test-internals	8m 6s
Test BaseOnPython execution, Python 3.9	19m 12s
test-asv-benchmarks	31s
test-clean-install-ubuntu	1m 12s
test experimental	11m 21s
test-ubuntu (engine python, python 3.9, group_1)	24m 37s
test-clean-install-windows	2m 44s
Test HDK storage format, Python 3.9	25m 7s
test-windows (engine python, python 3.9, group_1)	54m 40s
test (pyarrow, python 3.9)	6m 32s
test-ubuntu (engine unidist ${{ matrix.unidist-backend }}, python ${{ matrix.python-version }})	0s
test-ubuntu-sanity (engine ray, python 3.9)	25m 22s
test-spreadsheet (engine ray, python 3.9)	4m 9s
test-ubuntu-sanity (engine dask, python 3.9)	48m 56s
test-spreadsheet (engine dask, python 3.9)	4m 24s
test-ubuntu-sanity (engine unidist, python 3.9)	20m 38s
test-windows-sanity (engine ray, python 3.9)	36m 28s
test-windows-sanity (engine dask, python 3.9)	55m 51s
test-windows-sanity (engine unidist, python 3.9)	33m 21s
upload-coverage	21s
	6h 30m 38s

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