Redesign the different wallet contexts architecture

[steezeburger]

• create new to astria-wallet-context
  • this context remains global/top level
  • this is the context used by the other pages as well
  • only concerned with astria chain connection
• refactor evm wallet context provider and cosmos wallet context provider to only wrap the bridge page
• new useBridgeConnections hook that will consume astria-wallet-context, cosmos-wallet-context, and evm-wallet-context
  • this hook will manage source and destination chains
• implement deposit-page-context
  • will consume useBridgeConnections