vaguely correct struct and function signature generation

Cargo.lock

@@ -2,6 +2,180 @@
 # It is not intended for manual editing.
 version = 3
 
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Cargo.toml

@@ -7,3 +7,8 @@ repository = "https://github.com/oxidecomputer/progenitor.git"
 description = "An OpenAPI client generator"
 
 [dependencies]
+anyhow = "1"
+getopts = "0.2"
+serde = { version = "1", features = [ "derive" ]}
+serde_json = "1"
+openapiv3 = "0.4"