Find derivative recurrences from PDE (via parametric derivative taking) #1492

Job	Run time
Pylint	2m 23s
Mypy	1m 56s
Conda Pytest	37m 46s
Documentation	2m 2s
Tests for downstream project pytential	51m 21s
Conda Examples	2m 18s
Conda Pytest Symengine	36m 9s
Ruff	4s
Typos	5s
	2h 14m 4s

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