Implement retries for HTTP requests

[Acconut]

Currently, the Java SDK does not retry requests. There are two cases in which automatic retries (i.e. without the SDK user's interaction) would be helpful:

• if the HTTP request is not able to be completed because of a connection issue (tus already handles this for the uploads) but there are also other HTTP requests which could fail
• if the network connection is stable but the server is rejecting the request because the per-customer rate limit is hit (here, a delay should be applied before retrying, see exponential back-off algorithms)

[kvz]

• if the network connection is stable but the server is rejecting the request because the per-customer rate limit is hit (here, a delay should be applied before retrying, see exponential back-off algorithms)

you could also read the retryIn property which is returned by our API, then you can wait exactly the amount of seconds required (+1 :) and no more.

[cdr-chakotay]

Implemented with release 0.2.0