DRYify input validation

[dylanhmorris]

Would be good to have generic functions for common input validation tasks. Even better to depend on a well-liked/tested library for this.

Example: checking for an integer > x, which happens in a non-generic way here:

PyRenew/pyrenew/process/differencedprocess.py

Lines 234 to 245 in afbb340

	if not isinstance(differencing_order, int):
	raise ValueError(
	"differencing_order must be an integer. "
	f"got type {type(differencing_order)} "
	f"and value {differencing_order}"
	)
	if not differencing_order >= 1:
	raise ValueError(
	"differencing_order must be an integer "
	"greater than or equal to 1. Got "
	f"{differencing_order}"
	)

[damonbayer]

Example: checking for an integer > x

This already part of #403