Improve query/response structs in cosmwasm clientcontroller in e2e tests

[gusin13]

The structs could be grouped together in something like this

type QueryMsg struct {
    FinalityProvider *FinalityProviderQuery `json:"finality_provider,omitempty"`
    // Add other query types here as needed
    // For example:
    // Delegation        *DelegationQuery        `json:"delegation,omitempty"`
    // ValidatorSet      *ValidatorSetQuery      `json:"validator_set,omitempty"`
}

type QueryResponse struct {
    FinalityProvider *FinalityProviderResponse `json:"finality_provider,omitempty"`
    // Add other response types here as needed
    // For example:
    // Delegation        *DelegationResponse        `json:"delegation,omitempty"`
    // ValidatorSet      *ValidatorSetResponse      `json:"validator_set,omitempty"`
}

type FinalityProviderResponse struct {
    // Fields for finality provider response
}

// Define other response structs here