Perform retry of branch status reporting using random delay and exponential backoff

[iSuperCoder]

https://github.com/seata/seata-go/blob/c272389452b323182f64e22c4c00c244b2fd0a58/pkg/datasource/sql/tx.go#L240

When the TC cannot receive status report requests normally, for example, network congestion. A large number of status report requests will cause a stampede effect ,make the network more congested.

retry=1
maxCount=3
t = Pow(2, Min(retry, maxCount)) * 10

t is waiting time for next retry.The waiting time sequence is: 20ms 40ms 80ms.