[Feature Request]: Use farm_ng.core.Timestamp

[edgarriba]

Describe the feature you want

currently, all the protos in this project define time stamps with as double, however, to be more consistent with the rest of the farm-ng ecosystem libraries we could use the farm_ng.core.Timestamp data structure

https://github.com/farm-ng/farm-ng-core/blob/main/protos/farm_ng/core/timestamp.proto#L21-L25

message Timestamp {
    double stamp = 1;
    string clock_name = 2;
    string semantics = 3;
}

[Hackerman342]

This should be done so it is non-breaking for anyone using the double stamp directly