replace pyrsistent.PMap, immutables.Map with immutabledict #3372

Job	Run time
Mypy	1m 33s
Typos	3s
Pylint	1m 26s
Documentation	1m 37s
Conda Examples	2m 0s
Tests for downstream project arraycontext	2m 34s
Tests for downstream project meshmode	10m 4s
Conda Pytest with Intel CL	4m 11s
Tests for downstream project grudge	10m 30s
Conda Pytest (ubuntu-latest)	3m 57s
Tests for downstream project pytential	45m 39s
Conda Pytest (macos-latest)	3m 24s
Tests for downstream project pytato	6m 15s
Conda Pytest without arg check	3m 49s
Conda Pytest Twice (for cache behavior)	5m 16s
Ruff	5s
Tests for downstream project Firedrake	2m 44s
Validate CITATION.cff	7s
	1h 45m 14s

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