v1.1.0-multiden

Note: This release is consensus breaking for the provider, the changes are not needed on the consumer.

This release combines two fixes that we judged were urgent to get onto the Cosmos Hub before the launch of the first ICS consumer chain.

The first fix is to enable the use of multisigs and Ledger devices when assigning keys for consumer chains. The second is to prevent a possible DOS vector involving the reward distribution system.

Multisig fix

On April 25th (a week and a half ago), we began receiving reports that validators using multisigs and Ledger devices were getting errors reading `Error: unable to resolve type URL /interchain_security.ccv.provider.v1.MsgAssignConsumerKey: tx parse error when attempting to assign consensus keys for consumer chains`.

We quickly narrowed the problem down to issues having to do with using the `PubKey` type directly in the `MsgAssignConsumerKey` transaction, and Amino (a deprecated serialization library still used in Ledger devices and multisigs) not being able to handle this. We attempted to fix this with the assistance of the Cosmos-SDK team, but after making no headway for a few days, we decided to simply use a JSON representation

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