Switch to toml_edit from toml-rs for bevy_macro_utils

[Shatur]

What problem does this solve or what need does it fill?

toml-rs is unmaintained and it's a TOML 0.5 compliant parser.

What solution would you like?

It would be nice to use toml_edit. It's a drop-in replacement, actively maintained and supports TOML 1.0. For example, Cargo now use it.

[BorisBoutillier]

I'd be happy to tackle the PR for this.
But before starting, I'd like to have a confirmation from a more senior bevy-dev that this is a meaningful move. ( seems so to me).

[mockersf]

Makes sense to me to follow cargo 👍