add query endpoints for consumer chain params

[MSalopek]

Problem

An issue was discovered where a connection between an ICS consumer chain cannot be established with a sovereign chain because the ICS consumer is missing the staking module on which hermes relies on to establish clients. The unbonding_period parameter of ICS chains cannot be accessed via queries. Sovereign chains (of which all have the staking module) can be queries by hermes in order to learn their unbonding_period param.

Closing criteria

ICS consumer chains have a query endpoint which can list their parameters. Hermes and other relayers must be able to access that endpoint.

It should be clearly documented that relayers should query the ICS consumer endpoint instead of the staking module endpoint.

Problem details

More contexts can be found here

TODOs

• Labels have been added for issue
• Issue has been added to the ICS project