Improve lint driver entrypoint

[BD103]

This makes the bevy_lint_driver binary behave a bit more like clippy-driver, which means it also behaves a bit more like rustc. Some changes include:

• Panicking will now result in an ICE, which can be used to debug issues.
• Logging is now setup, so you can set the RUSTC_LOG variable to configure logging levels and scope. (It uses tracing internally!)
• Exit code logic now mirrors the functionality recommended for rustc drivers: specifically using catch_with_exit_code().

I'm currently debugging an issue with this where serde_derive fails to compile (I believe it's the rustc_driver::args::raw_args() call), so I'll update this when I fix it. :)

[BD103]

although I don't really have any experience with the rustc internals :)

That's fine! I don't expect you to know rustc internals, I just want a second set of eyes for testing and code quality reasons. :)