Hook the integration tests into rust's test framework.

Instead of using a hacked-together shell script, use rust's test framework to do the comparison.

Cargo.toml

@@ -5,6 +5,10 @@ edition = "2021"
 license = "0BSD"
 default-run = "toy"
 
+[lib]
+name = "organic"
+path = "src/lib.rs"
+
 [[bin]]
 name = "toy"
 path = "src/main.rs"
@@ -23,6 +27,9 @@ tracing = "0.1.37"
 tracing-opentelemetry = "0.17.2"
 tracing-subscriber = {version="0.3.16", features=["env-filter"]}
 
+[build-dependencies]
+walkdir = "2.3.3"
+
 [features]
 default = ["compare"]
 compare = []