[feature] Circuit Breaker

This contains 1/2 of the circuit breaker. The change here is that if we mint more than the max supply of rune, burn some rune from the reserve to restore the supply at 500m.

The second part is pausing opening of loans in this scenario.

Code Walkthrough https://www.youtube.com/watch?v=e6gZ77DdMrc

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Is the max supply 500m or will it set after the kill switch burn? because there are some rune burned during kill switch and max supply decreased to less than 500m

Note the line
maxAmt, _ := k.GetMimir(ctx, "MaxRuneSupply")
; my current impression is that MaxRuneSupply might be set to 500m (starting with some gap before the circuit breaker were hit).

correct

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I was for some reason under the impression that the idea of the circuit breaker was to just fail the mint in the transaction once we hit the cap instead of burning the reserve to rectify it, was that never on the table? If that were the case it would force savers and borrowers to assume the risk of their deposit getting stuck and having to wait until a better time. If we burn the reserve then RUNE holders and nodes subsidize impatient users, and I'm unsure how I feel about that.

mentioned in merge request !2713 (merged)

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I would still personally prefer skipping the reserve burn and just allowing the inflation, but sounds like in discussion that I missed everyone came to agreement on the reserve burn so I defer to the consensus - code LGTM.

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on the same page as @ursa9r, code looks good, if consensus is to burn, i'll smash approve

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As a policy going forward we should document discussions/consensus about major economic changes like this on the PR.

Can someone please copy/paste the relevant discussion where a quorum was reached on this?

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mentioned in issue #1501 (closed)

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Failing regtest

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approved this merge request

mentioned in merge request !2851 (closed)

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Please rebase for 1.109.0

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