feat: add multiline support

[xbcsmith]

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src/main.rs:116

• Consider adding tests to verify the behavior of the YAML emitter when the '--multiline' flag is enabled.

if multiline {

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testdata/foo.yaml:3

• [nitpick] Consider using YAML's literal block style (as used in testdata/bar.yaml) for multiline strings to ensure consistent formatting across test cases.

  - bar: "echo 1\necho 2\n"

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