Add signers

[vitormattos]

to-do

• Get allowed identification methods from backend.
  • Check if is possible to use initial state
• Hide signers list when click at add signer
• List allowed identification methods
  • Create a component by identification method
    • Flag mandatory methods and validate if is filled
    • Account
      • Need to list accounts when typing. Check file_sharing app when share a file with an account.
    • Add button to delete an identification method
      • Can't delete a factor that is mandatory
• Implement button to add factor
  • Only add a factor that aren't added
• Save identification methods
  • Validate response to check if have an error and implement the logic to don't close the add signers screen when have an error reported by API.
  • Reload signers list when save the current signer.
• Define name of signer. Not mandatory. If haven't a name will use the identification method of first mandatory identification method. This logic already exists at backend.

[vitormattos]

closed by #1873