Fix ByKey methods

Fix ByKey methods missing /key/ in request URL

Added field `deserializeValues` for setting query parameter

Added field deserializeValues for setting query parameter

Fix external Task Service url and add extendLock method

Fix external Task Service url and add extendLock method

improve process instance service

improve process instance service

v1.1.1: fix null response bug

fix null response bugs when Camunda is down

v1.1.0: history identity link log service

add history identity link log service

v1.0.0

Initial version.