mCaptcha Cache

Redis module that implements leaky bucket algorithm

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## Motivation [mCaptcha](https://github.com/mCaptcha/mCaptcha) uses a [leaky- bucket](https://en.wikipedia.org/wiki/Leaky_bucket)-enabled counter to keep track of traffic/challenge requests. - At `t=0`(where `t` is time), if someone is visiting an mCaptcha-protected website, the counter for that website will be initialized and set to 1. - It should also automatically decrement(by 1) after a certain period, say `t=cooldown`. We call this cool down period and is constant for a website. - If at `t=x`(where `x