Remove `BatchContainer::{copy, copy_range}`. #349

Job	Run time
test mdBook	1m 0s
cargo test on ubuntu, rust stable	1m 8s
cargo test on ubuntu, rust 1.78	1m 6s
cargo test on macos, rust stable	1m 8s
cargo test on macos, rust 1.78	1m 15s
cargo test on windows, rust stable	1m 58s
cargo test on windows, rust 1.78	1m 49s
	9m 24s

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