Integrate SDK v6 API

[sridharmeganathan]

Description

• Replace mock endpoints with actual endpoints to fetch
  • Supported tokens
  • Token and its balances
  • Broadcasting the transaction to network
• Fetch account nonce, auth module information for multi-signature account to be able to compose and send the transaction to network

Acceptance Criteria

• Users should be able to select the supported tokens and send them to users
• Users should be able to select the supported tokens and request them from users
• User should be able to sign and broadcast transaction to network
• User should receive feedback when failed to send transaction to network
• Add e2e tests for
  • Send LSK tokens within application
  • Send LSK tokens across application
  • Send native tokens within application
  • Send native tokens across application
  • Receive LSK tokens within application
  • Receive LSK tokens across application
  • Receive native tokens within application
  • Receive native tokens across application