Rust

refactor: rename PreambleBuilder to SystemPromptBuilder #62

Job	Run time
build-and-test (macos-latest, aarch64-apple-darwin, false)	1m 27s
build-and-test (windows-latest, x86_64-pc-windows-msvc, false)	2m 15s
build-and-test (ubuntu-latest, x86_64-unknown-linux-gnu, false)	40s
publish-crate	0s
	4m 22s

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