When an attr value has newlines in it, it can make the value of the attr a little hard to scan. For example, in the below output, consider the "errorVerbose" attribute. The value of this attribute is:

boom

main.testVariousHandlers
        /Users/regan/dev/flume/v2/cmd/demo/main.go:215
main.main
        /Users/regan/dev/flume/v2/cmd/demo/main.go:78
runtime.main
        /opt/homebrew/Cellar/go/1.23.4/libexec/src/runtime/proc.go:272
runtime.goexit
        /opt/homebrew/Cellar/go/1.23.4/libexec/src/runtime/asm_arm64.s:1223

It's a little hard to scan, because the first line of the value ("boom") appears on the same line as the key, and the last line of the value also includes the "size" attr.

I have some sample code which sorts all multi line values to the end of the buffer, so simple values are all on a single line together, and then the multi-line values are each printed on their own line. Note how the key and the value each have their own line. I also used a different separator for them (":" instead of "="), just as an experiment. Would you consider a PR for something like this?