Add endpoint for netAmount, bTokenRate

[dongsam]

Summary

Add endpoint for netAmount or bTokenRate

Problem Definition

The netAmount is information that changes from moment to moment depending on staking, validator, liquidstaking dependence, we you need to decide whether to temporarily store and deliver kv for endpoint in endblock or calculate and deliver every time.

-> we decided to calculate directly every request on the endpoint

Proposal

add states endpoint

• squad/liquidstaking/v1beta1/states
• squad query liquidstaking states

endpoint example

{
  "net_amount_state": {
    "mint_rate": "0.998998080878542686",
    "btoken_total_supply": "500000000",
    "net_amount": "500501461.985080192496888896",
    "total_del_shares": "500499999.000000000000000000",
    "total_liquid_tokens": "500499999",
    "total_remaining_rewards": "1458.985080192496888896",
    "total_unbonding_balance": "0",
    "proxy_acc_balance": "4"
  }
}

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