`Bcast` object wrappers, attempt 2 #1768

Job	Run time
Mypy	1m 37s
Ruff	5s
Typos	3s
Pylint	1m 36s
Documentation	1m 38s
Tests for downstream project meshmode	1m 39s
Examples Conda Py3	1m 23s
Pytest Conda Py3 Intel	1m 38s
Tests for downstream project grudge	1m 25s
Tests for downstream project mirgecom	5s
Pytest Conda Py3 POCL	1m 34s
Tests for downstream project mirgecom_examples	3s
	12m 46s

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