Elided lifetime changes in `rust_2018_idioms` lint is very noisy and results in dramatically degraded APIs for Bevy

Problem

With the upcoming release of Rust 2024 edition, we're concerned that rust_2018_idioms will be deny by default.

[Editorial comment (TC): This is not an edition item for Rust 2024, and the edition is not accepting any new items, so we can say definitely that this will not be tied to the release of Rust 2024. See here.]

We investigated what these changes will entail for Bevy in https://github.com/bevyengine/bevy/pull/15916, and the impact is quite severe. Our primary user-facing system and query APIs are littered with meaningless lifetimes.

This is a much worse experience with no upside for us, and Bevy and its entire ecosystem will have to manually allow this lint on every project.

Proposed solution

We would appreciate if the elided lifetimes lint could be split out from the rest of the rust_2018_idioms linting, which we generally liked the effect of.

Ideally this would be off by default as well, to avoid needing to teach new users to turn it off as a critical part of project setup.

Start with the issue discussion and the Bevy investigation in PR 15916 to understand the API impact and the requested lint behavior. Determine whether the elided-lifetimes lint can be separated from rust_2018_idioms and how its default setting should work; done means the proposed separation and default behavior are defined and validated.