Global Liquid Staking Cap

[sampocs]

Context

As an additional safety measure for liquid staking, this PR introduces a global liquid staking cap. For instance, a cap of 0.3 means only 30% of staked ATOM can be liquid staked. The liquid staking volume is determined by tracking tokenized shares and/or delegations from ICA accounts. The total stake is calculated from the total balance of the Bonded pool.

ADR (courtesy of @riley-stride)

Action Item: There is still 1 small required change to the evidence module to handle tombstoned validators (see ADR/Spec)

Brief Changelog

• Added global_liquid_staking_cap parameter
• Added keeper functions to track the total liquid staked across all delegations
• Added helper functions to track the global liquid stake and the validator’s liquid shares
• Added error cases and accounting changes to Delegate/Undelegate/Redelegate/TokenizeShares/RedeemTokens to accommodate the global and validator caps
• Fixed broken ValidatorBond unit test and added additional test cases

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[faddat]

moment on this one -- I am going to do a bunch of branch tidying and get this in.

Thank you so much.

[faddat]

@sampocs -- I am not 100% sure about this one.

I think that I may prefer a tax to a cap.

wdyt?

[sampocs]

Moved ADR to #66 so we can include a static link for the proposal