Allow chains to disable controller or host functionality in interchain accounts

[colin-axner]

Summary

There should exist governance parameters which enable or disable host or controller chain functionality. If the controller chain functionality is enabled, the controller side code should ensure the controller authentication module is not nil. Passing in a nil authentication application to ica.NewIBCModule should be considered valid (this overrides the on chain parameter as no authentication module is provided)

Code changes needed to close issue:

• adding host/controller parameters (Add Enable/Disable controller/host on-chain params #566)
• Add gRPC/cli for host/controller parameters (Add gRPC and cli queries for host/controller parameters #569)
• Add if statement checks to disable host or controller usage on handshake and packet callbacks
• Validate params in genesis

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