feat(access-node): add v2 endpoints

access-node/access_node/include/insite/jsonStrings.h

...s-node/access_node/include/insite/nest/nestKernelStatus.h

access-node/access_node/include/insite/nest/nestMultimeter.h

...access_node/include/insite/nest/nestMultimeterContainer.h

access-node/access_node/include/insite/nest/nestNode.h

...node/access_node/include/insite/nest/nestSpikeRecorders.h

access-node/access_node/include/insite/nest/nestSpikes.h

access-node/access_node/include/insite/nest/nestVersion.h

access-node/access_node/include/insite/spike.h

access-node/access_node/include/insite/spikedetector.h

access-node/access_node/include/insite/utilityFunctions.h

access-node/access_node/main.cpp

access-node/access_node/nest/kernelStatus.cpp

access-node/access_node/nest/nestMultimeter.cpp

access-node/access_node/nest/nestMultimeterContainer.cpp

access-node/access_node/nest/nestNode.cpp

access-node/access_node/nest/nestSpikes.cpp

access-node/access_node/nest/nest_endpoints.h

access-node/access_node/nest/spike.cpp

access-node/access_node/nest/spikedetector.cpp