Scaffold Basic Extension UI and RPC to submit a transaction

[kratico]

Tasks

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1. fetch selected account balance
2. handle form fields and submission with react
3. fetch accounts from extension
4. validate destination address
5. use PAPI to encode the transaction calldata
6. transfer should trigger an extension popup that signs the transaction
7. extract transaction submission into a hook
8. follow transaction submission events until it is finalized
9. share observable client across hooks/components
10. feat: add DecodedCallData component #1914
    +0
11. add block number
12. transaction hash
13. switch between chains
14. add transaction fee