Add cd and git clone functionality to check-diff crate

Included unit tests for the new functionality as well.

Author: benluiwj

check_diff/Cargo.lock

@@ -7,3 +7,7 @@ edition = "2021"
 
 [dependencies]
 clap = { version = "4.4.2", features = ["derive"] }
+tracing = "0.1.37"
+tracing-subscriber = { version = "0.3.17", features = ["env-filter"] }
+[dev-dependencies]
+tempfile = "3"