Add Ease trait to Transform

[julcst]

Objective

Fixes #21316

Solution

Adds a new optional dependency on bevy_transform to bevy_math to use Transform::interpolate with easing

Testing

I did not test these changes

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[Jondolf]

I would much prefer if this was in bevy_transform and not in bevy_math. For the most part, bevy_math is intended to be purely a math and geometry focused standalone(-ish) crate with minimal dependence on the rest of Bevy. It would make more sense to have all the Transform functionality in bevy_transform instead of scattering it around several crates, especially when bevy_transform already depends on bevy_math

[Jondolf]

I believe bevy_transform would just need to enable the curve feature for bevy_math to make Ease available. We could either do this unconditionally, or put it behind some ease feature in bevy_transform

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[alice-i-cecile]

I would much prefer if this was in bevy_transform and not in bevy_math

Seconded!

We could either do this unconditionally, or put it behind some ease feature in bevy_transform

I'd prefer a simple ease or animation feature.

We should also do this for the other transform types if we're doing this.

[julcst]

One could also extract the interpolate function into a trait Interpolatable and implement Ease for Interpolatable, right?

[alice-i-cecile]

Yep, but we should only do that in a separate PR.