Add an implementation of np.vdot to PytatoPyOpenCLArrayContext #1686

Job	Run time
Documentation	1m 43s
Tests for downstream project meshmode	13m 0s
Mypy	1m 41s
Examples Conda Py3	1m 44s
Tests for downstream project grudge	10m 25s
Tests for downstream project mirgecom	3s
Pylint	1m 42s
Pytest Conda Py3 Intel	2m 16s
Tests for downstream project mirgecom_examples	6s
Pytest Conda Py3 POCL	2m 26s
Ruff	5s
Typos	3s
	35m 14s

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