Add command to set up fast compiles configuration

[TimJentzsch]

Add a new command (e.g. bevy fast-compiles) to guide the user through the process of improving compile times.

It should be interactive, asking the user about their preferences.
At the end, the user should be asked if the configuration should be saved locally and applied to all projects (in ~/.cargo/config.toml) or saved in the repository.

At the start, the CLI should ask if the user wants to use nightly rust and then only provide the nightly only options if the user agrees.

Some things we can set up:

• Faster linker (e.g. mold or lld)
• Cranelift backend
• Dynamic linking

[TimJentzsch]

Prior work e.g. this template: https://github.com/laundmo/simple_bevy_template/blob/main/init-script.rhai

But it doesnt have a license yet it does now

[BD103]

Could we make this more general? Such as a bevy setup command that can do more than just fast compilation?

[TimJentzsch]

Could we make this more general? Such as a bevy setup command that can do more than just fast compilation?

Sure, works for me!