Sequencer bond management + slashing - Impl

[danwt]

Research and ADR:

https://www.notion.so/dymension/sequencer-jailing-slashing-3455fe70923143cbbfd8f96d71deb583
https://www.notion.so/dymension/Sequencer-Bond-Management-Slashing-117a4a51f86a807998d8e3213ae3c1f2

[danwt]

This issue supersedes the folllowing, which aren't important anymore. They will all be solved by implementing the new design:

• bond EPIC: x/sequencers cleanup unbonding / jail / slash #1055
• fix liveness slash bugs #1282
• https://github.com/dymensionxyz/research/issues/423
• x/sequencers: check jail not imply 100% slash assumption #1063
• Potential unfair slashing of new proposers due to liveness event timing #1256
• The first proposer can DoS the rollapp without being slashed #1259
• x/sequencers: fix DOS/inefficiency in getSequencerDecreasingBonds #1065
• Flaws in the unbonding process allow for instant withdrawals #1257
• https://github.com/dymensionxyz/research/issues/364
• x/sequencers: document reason for only bonded sequencer able to reduce bond #1072
• x/sequencers: document and fix insufficient bond check in bond reduction completion #1069
• x/sequencers: jailed check on bond reduction is not needed #1067
• x/sequencers: split sequencer unbond and bond reduction concepts #1062
• x/sequencers: simplify bond update allowed to take sequencer #1059
• x/sequencers: bond reduction min bond check remove callsites #1064
• fraud liveness: schedule another liveness event if sequencer is jailed? #1050

The following still need to be double checked:

• Incorrect Coins comparison allows decreasing sequencer bonds below the configured minimum #1255
• Slash should not burn non-dym #1262