Find derivative recurrences from PDE (via parametric derivative taking) #1481

Job	Run time
Ruff	4s
Pylint	2m 24s
Documentation	2m 5s
Tests for downstream project pytential	50m 46s
Conda Examples	2m 22s
Mypy	2m 3s
Conda Pytest	37m 24s
Conda Pytest Symengine	36m 26s
Typos	6s
	2h 13m 40s

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