Resource amount input + type selector

[mpetrunic]

Implementation details

• provide styling from figma
• resources should be filtered based on src/dest networks
  • resource selector should be disabled until both networks are selected
• on resource selected, wallet balance should be presented
  • refresh balance periodically
• display warning if input amount is greater than balance (but don't prevent transfer as we might have wrong balance)
• implement logic for "useMax" button

Testing details

Acceptance Criteria