Create Tx form generation roadmap

[abefernan]

• [x] Add new unimplemented create form view. Hidden and accessible with keyboard shortcut (#235)
• [x] Load msg types from cosmjs-types, filter out those without amino support, build a registry with codecs and useful data (#236)
• [x] Add initial form utils (#237)
• [x] Improve form utils with specific field helpers (#241)
• [ ] Add shared form fields
  • [x] Address (#238)
  • [x] Amount (#239)
  • [x] String (#242)
  • [x] Number (#243)
  • [x] Boolean (#244)
  • [x] Timeout Height (#245)
  • [x] Description (#246)
  • [x] Commission (#247)
  • [x] Vote option (#248)
  • [x] Salt (#249)
  • [ ] AccessConfig
  • [ ] JSON Editor
  • [ ] Vote options weighted
  • [ ] Inputs (multisend)
  • [ ] Outputs (multisend)
• [x] Add msg selector to new create tx view with custom validation per msg type (#240)
• [ ] Make sender addresses auto-filled (sender, delegatorAddress, depositor, etc.)
• [ ] TBD