Add vdot to BaseFakeNumpyNamespace #2001

Job	Run time
Examples Conda Py3	1m 58s
Ruff	8s
Pytest Conda Py3 POCL	3m 4s
Pytest Conda Py3 Intel	2m 42s
Documentation	2m 14s
basedpyright	2m 15s
Typos	4s
Tests for downstream project meshmode	10m 38s
Tests for downstream project mirgecom	6s
Tests for downstream project grudge	11m 46s
Tests for downstream project mirgecom_examples	5s
	35m 0s

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