subprojects/parseq/src/main/java/com/linkedin/parseq/EngineBuilder.java
public EngineBuilder setEngineProperty(String key, Object value) {
    _properties.put(key, value);
    return this;
  }
public EngineBuilder setEngineProperty(String key, Object value) {
    _properties.put(key, value);
    return this;
  }
Sets an engine related property on the engine.
That property can then be accessed by tasks via the Context.

@param key
@param value
@return this builder