Transaction Review and Approval

[kratico]

Tasks

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1. PolkadotProvider implement spec JsonProvider.createTx(from, callData)
2. UI to unlock the needed account private key for signing
3. UI to prompt the user to review, approve and submit the extrinsic
4. Component to show the decoded call
5. Component to prompt chain signed extensions user inputs (for example: fees, mortality, etc.)
6. UI or Popup to follow the extrinsic submission events or status (should be done by the DApp)
7. Internal RPC spec and background implementation for all the above

[ryanleecode]

signing will be tracked in: https://github.com/orgs/paritytech/projects/134/views/3?pane=issue&itemId=52926853