TEXTUAL Value Renderer for `Coin` and `Coins`

[amaury1093]

Part of #11970

Add value renderers for Coin and Coins, as defined in ADR-050. Only the Format method is needed for now, the Parse one can be left for later.

• Add both Coin and Coins implementation
  • Make sure state query for coin metadata works.
• Use shared test vectors with CosmJS Implement Sign Mode Textual cosmjs#1147