Add an implementation of np.vdot to PytatoPyOpenCLArrayContext #1687

Job	Run time
Examples Conda Py3	1m 22s
Mypy	1m 51s
Tests for downstream project meshmode	13m 21s
Documentation	1m 43s
Tests for downstream project grudge	10m 32s
Pylint	1m 44s
Tests for downstream project mirgecom	2s
Tests for downstream project mirgecom_examples	3s
Pytest Conda Py3 Intel	2m 9s
Pytest Conda Py3 POCL	2m 33s
Ruff	7s
Typos	3s
	35m 30s

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