[Sprint/InterestingIguana](feat): Offchain boost rate limiting #475

Closes #475 (closed)

May need to distribute off-chain tokens for staging, using the php-cli. php cli.php rewards issue --username=nemofin --amount=10000

Need to do some testing, and run this by somebody. Not 100% sure I've properly filtered down the transactions as the number coming out is not quite what I'd expect (though is close). Could be related to ES running under low disk constraints.

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• 6015b386 - Added in rate limits for offchain boosts.
• ad1bd20f - Updates, refactor and added tests

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• 21f43ead - Updated, added in reduce for counting impressions and extra test

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• 1e8d36d4 - spacing
• 3817cb1f - syntax

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mentioned in issue #591 (closed)

mentioned in issue #592 (closed)

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approved this merge request

@eiennohi @brianhatchet did you test with tokens? I was trying to get into this with kubectl to issue some to people. (this may have to wait till monday but if you haven't already got some, send me your usernames on staging)

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1. boosted for 5000
2. boosted dif post for 4000
3. boosted dif post for 2000 - error
4. boosted for 1000 - success (max of 10k now reached)
5. boosted for 1000 - error