Option to sleep between max quota requests

[viniciusbarros]

Background:

• Existing observed issue: Rate exceeded #29
• When running the auto subscribe in an AWS account with large amount of LogGroups (almost 1000). It was observed that throttling happened (more than 5 times) when getting data from LogGroups and it was not possible to auto subscribe to existing groups. The timeout was increased, but still we were not able to process all log groups in the account.
• We tried an alternative method, which includes a sleep between the AWS Default Max Requests Per Sec Quota requests and not only we were able to process all log groups, but it was actually a bit faster than the existing exponential retry method.

Existing:

Took  190.973  seconds with 0 ms sleep
{ subs: 33, skips: 909, error: 5, throttled: 15 }

Optimized approach:

Took  189.895  seconds with 500 ms sleep
{ subs: 33, skips: 909, error: 5, throttled: 0 }

Changes:
Adding 2 optional parameters that allow users to specify the max quota (x) they have setup on their AWS accounts, and also to set a sleep time which happens right after (x) requests have been made.

[lmammino]

👍🏽 for this feature!