Function cache_object_computation

Similar to `cache_file_computation`, except the computation is not on the contents of a file but rather on some arbitrary object with a name and a hash. If the computation has previously been performed on the same name and hash, the previous result is returned. Otherwise the computation is performed and saved in the cache for future invocations.

(
    cache_path: &Path,
    object_name: &str,
    hash: HashCode,
    key: &str,
    f: F,
)