Rename bevy_math::rects conversion methods

[RCoder01]

Objective

Some of the conversion methods on the new rect types introduced in #7984 have misleading names.

Solution

Rename all methods returning an IRect to as_irect and all methods returning a URect to as_urect.

Migration Guide

Replace Rect::as_urect with Rect::as_irect, Rect::as_rect with Rect::as_urect, and URect::as_urect with URect::as_irect.

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[RCoder01]

Does anything need to be done to ensure this (possibly breaking) change applies to 0.12 and not 0.11.1?

[Selene-Amanita]

Does anything need to be done to ensure this (possibly breaking) change applies to 0.12 and not 0.11.1?

I think commits are just cherry-picked from the main branch to apply to the 0.11.0 commit, so nothing special to do.

Also, I think a breaking change on an API introduced in 0.11.0 may be fine??? Really not sure about that probably not, it does break semver.

[james7132]

Can you please update the Migration guide to be a bit more exact? As it currently stands, it's not particularly useful for someone trying to follow the guide.