Would printing progress messages to stderr instead of stdout be a breaking change?

[rohitpaulk]

When running gleam run, it's difficult to pipe output since compiler progress messages are printed to stdout. I'm working on #2299, but just realized that this wouldn't be so much of a problem if the messages were printed to stderr instead of stdout.

Since Gleam is post-v1, wanted to ask about this first - would changing these messages to print to stderr instead of stdout be considered a breaking change?

gleam/compiler-cli/src/cli.rs

Lines 122 to 124 in 8743158

	pub(crate) fn print_compiled(duration: Duration) {
	print_colourful_prefix("Compiled", &format!("in {}", seconds(duration)))
	}

[lpil]

Sounds like a good idea to me

#3497