DRIVERS-1713 Convert change stream spec tests to the unified format. (#570)

Author: abr-egn

etc/change_stream_legacy/.gitignore

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+/target

etc/change_stream_legacy/Cargo.toml

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+[package]
+name = "change_stream_legacy"
+authors = ["Abraham Egnor <[email protected]>"]
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+serde = { version = "1.0", features = ["derive"] }
+serde_with = "1.11"
+serde_yaml = "0.8"
+clap = { version = "3.0.13", features = ["derive"] }