[Enhancement]: relative tolerance for test_rules

[ThijsJenneskens]

Feature/Enhancement Description

Allow relative tolerance to be specified in testing rules, the same way absolute tolerance is currently specified. An example call would look like:

@test_rules [check_type_promotion = true, rtol = 1e-4] ...,

etc.

Motivation / Use Case

It would be useful for testing the numerical stability of rules, where the inputs are huge or tiny numbers.

Proposed Solution

An example call would look like:

@test_rules [check_type_promotion = true, rtol = 1e-4] ...,

Alternatives Considered

The 'isapprox' function is being called under the hood, so specifying the relative tolerance manually is difficult.

Example Use Cases

No response

Priority (from your perspective)

Important

Related Issues / Discussions

No response

Additional Context

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