v0.2.0

• remove exponential back off logic from insertAll driven streamer client,
  as this logic is already built-in the std BQ client used internally;
  • we do still keep the max deadline on top of that by using a deadline context;
• remove the builder-pattern approach used to build a streamer,
  and instead use a clean Config approach, as to keep it as simple as possible,
  while at the same time being more Go idiomatic;
• upgrade google.golang.org/grpc to v1.41.0, was on v1.40.0;