Enhancement to NPU memory sensors for Junos Telemetry Interface

The format of telemetry data exported through gRPC for NPU memory and memory utilization implements prefix compression. This change reduces the payload size of data exported. The following example shows the new format: key: __prefix__ str_value: /components/component[name='FPC0:NPU0']/properties/property key: [name='mem-util-edmem-size']/value uint_value: 12345 Telemetry data is exported in key-value pairs. Previously, the data exported included the component and property names in a single key string.