Subject to provisions of general law, this state or any political subdivision thereof, any governmental authority or any combination thereof may enter into agreements for the performance, financing or execution of their respective functions, with any one or more of the other states, the United States, the Dominion of Canada, or any political subdivision thereof unless otherwise provided in this constitution. Any other provision of this constitution notwithstanding, an officer or employee of the state or of any such unit of government or subdivision or agency thereof may serve on or with any governmental body established for the purposes set forth in this section and shall not be required to relinquish his office or employment by reason of such service. The legislature may impose such restrictions, limitations or conditions on such service as it may deem appropriate.