Remove `SensorMetricSample` in favour of `MetricSample`#346

tiyash-basu-frequenz merged 2 commits intofrequenz-floss:v0.x.xfrequenz-floss/frequenz-api-common:v0.x.xfrom

tiyash-basu-frequenz:339_sensor_metric_sampletiyash-basu-frequenz/frequenz-api-common:339_sensor_metric_sampleCopy head branch name to clipboard