feat(api): improve codegen outputs (#41)

* Use `[]byte` for generated request bodies when the source schema has `format: byte`
* Gzip-compress request bodies when `Content-Encoding: gzip` is set
* Require that all models returned as error conditions in our API implement the `error` interface
* Move the implementation for `api.HealthCheck` out of `ping.go` and into `api/error.go`


Co-authored-by: William Baker <55118525+wbaker85@users.noreply.github.com>

etc/generate-openapi.sh

@@ -24,5 +24,5 @@ docker run --rm -it -u "$(id -u):$(id -g)" \
 
   # Clean up the generated code.
   cd "${ROOT_DIR}"
-  make fmt
+  >/dev/null make fmt
 )