Address validation for bank balances

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Summary

This is the feedback from the QA process of lbm v0.1.0-rc1.

I think we need to check the address when we query balances. At least the bech32 format test should be performed.

$ simd query bank balances link146asaycmtydq45kxc8evntqfgepagygelel00h
balances:
- amount: "89989999900"
  denom: stake
- amount: "100000000000"
  denom: ukrw
pagination:
  next_key: null
  total: "0"
$ simd query bank balances link146asaycmtydq45kxc8evntq
balances:
- amount: "89989999900"
  denom: stake
- amount: "100000000000"
  denom: ukrw
pagination:
  next_key: null
  total: "0"
$ simd query bank balances aaa
balances: []
pagination:
  next_key: null
  total: "0"

Problem Definition

Proposal

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