feat: simapp append more add-genesis-account coins after initialization

[Reecepbcups]

Summary

Add the ability to add more coins (both in amount and/or in new denominations) after the initial creation of a genesis account if specified.

simd init testing
simd add-genesis-account cosmos1c5ndezk603hyr4jfrdu3t2czpzpezcqr37h9tz 100uatom
simd add-genesis-account cosmos1c5ndezk603hyr4jfrdu3t2czpzpezcqr37h9tz 50uatom --append
simd add-genesis-account cosmos1c5ndezk603hyr4jfrdu3t2czpzpezcqr37h9tz 25utoken --append

genesis file:

"balances": [
  {
    "address": "cosmos1c5ndezk603hyr4jfrdu3t2czpzpezcqr37h9tz",
    "coins": [
      {
        "denom": "uatom",
        "amount": "150"
      },
      {
        "denom": "utoken",
        "amount": "25"
      }
    ]
  }
],
"supply": [
  {
    "denom": "uatom",
    "amount": "150"
  },
  {
    "denom": "utoken",
    "amount": "25"
  }
],

Problem Definition

By adding this feature it in, it will simplify genesis creation (and airdrops) for future chains.

This allows a developer to perform airdrop logic for one or more chains, then put each into their own shell file to add the genesis accounts.
(Personally I needed this both for the eve & craft economy chains)
The current way to do this now is have 1 large script do ALL of the logic calculations every time. This reduces that complexity and makes it more modular.

Proposal

If a --append flag is given to the simd add-genesis-account sub command, add the new token to the users balance and increase the supply

PR: #13233