snpschaaf

okapi: fix deserialisation for openapi3 'extensions' fields

5

The 'extensions' fields of various structs within okapi/src/openapi3.rs was not deserialized correctly. ```rust #[serde(flatten)] ``` was empty. The 'extensions' fields used a custom type 'Object'. 'Object' is an alias for...

I extended the interface to access cranes setting `cargoTestExtraArgs` . Users can do so now via `testFlagsExtra` (named like `testFlags` does for `cargoTestFlags`).