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gh-37681: Quaternion Ideal Pushforwards and Pullbacks
Added to quaternion fractional ideal class (`QuaternionFractionalIdeal_rational`), two methods `.pushforward` and `.pullback` from Lemma 2.1.7 of the [thesis of Antonin Leroux](https://w ww.lix.polytechnique.fr/Labo/Antonin.LEROUX/manuscrit_these.pdf), where `I1.pushforward(I2)` returns the ideal that is the pushforward of `I1` through `I2` and `I1.pullback(I2)` returns the ideal that is `I1` pulled back through `I2`. The optional parameter `side` indicates whether they should be treated as left or right ideals. In the default case `side=None`, and it is interpreted as the side which makes sense depending on the shared left/right orders. For now this only works for integral ideals where `I1` and `I2` have coprime norms, but perhaps there is a sensible way to define these concepts for other cases. URL: #37681 Reported by: jtcc2 Reviewer(s): jtcc2, Sebastian A. Spindler, Travis Scrimshaw
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