feat: Add `author_id` property #1156

Job	Run time
Check formatting	17s
cargo clippy (macOS-latest)	43s
cargo clippy (windows-2019)	1m 58s
cargo-deny	23s
find-msrv	2s
cargo clippy (ubuntu-latest)	41s
generate-headers / Generate headers	46s
cargo test (macOS-latest)	53s
cargo test (windows-2019)	1m 59s
cargo test (ubuntu-latest)	44s
	8m 26s

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