Sommelier v8

[cbrit]

• cellarfees v2: Remove fee accrual counters in favor of fee token USD value threshold (x/cellarfees v2 work #280 )
  • Support arbitrary token denom, implicitly supporting IBC tokens
• cellarfees v2 upgrade handler
  • Remove fee accrual counter state
  • Add auction.v1.TokenPrice for new fee denoms (if any), and maybe go ahead and update old ones if they haven't been recently.
• x/auction upgrade
  • Remove requirement that denoms have the gravity prefix
• x/auction upgrade handler
  • Consensus version 2
• Include gravity release containing SendEthereumTxConfirmation bugfix
• Add generalized address mapping state (Generalized eth <-> somm address mapping state #288 )
  • Note: with 0 tx fees this is a good way to have spammers bloat state if we're not careful (turn on tx fees???)
• ? Upgrade to Cosmos SDK v0.47 ?
• Consider creating banktypes.Metadata when a TokenPrice is added for clients to interpret their balances through a more familiar API

Post upgrade todo:

• Request that mintscan and keplr update their APY endpoints from cellarfees/v1 to cellarfees/v2
• Turn on gravity slashing (or do this during upgrade?)