Update import/export account for Cardano

[nampc1]

• Allow import/export for 15-word seed phrase
• Warn users about wallet compatibility upon creating unified account -> No need
• Support import/export JSON file for Cardano on Unified account
• Fix bug importing watch-only account
  

[Sokol142196]

• Show popup Incompatible seed phrase when import Cardano account (15 words)
  • Actual:
    • Show popup Incompatible seed phrase
    • Create Unified account
      
  • Expect: Do not show popup, create Cardano solo account

[bluezdot]

Show popup Incompatible seed phrase when import Cardano account (15 words)

Polkadot.js (Substrate) and Metamask (Ethereum) also supported for 15-words seed. The accounts created from those wallets are compatible with the unified account created from SubWallet => We can create unified account from 15-words seed.

[haiyenvu23]

Version test : https://drive.google.com/file/d/1NgxGl4k5h07zsh-JF9E6DqZLFt66MOKL/view?usp=sharing
Validation passed in case :

• Install/Update version

• Allow import/export for 15-word seed phrase
  

• Re-check create new account and import by seed phrase on other wallets

• Support import/export JSON file for Cardano on Unified account
  

• Re-check export on account detail

• Re-check export all mode

• Re-check export with popup back up seedphrase

• Check when import watch only Cardano account