Add utility methods to build, sign, and send a transaction

[s8sato]

Add utility methods to build, sign, and send a transaction. Something like:

• [x] ~createTransactionPayload~
  • The request was canceled because your example helped them @0x009922
• [ ] signTransactionPayload
• [ ] submitVersionedTransaction

[0x009922]

• createTransactionPayload - what exactly is needed here? Transaction payload could be created by hand with TransactionPayload() helper from @iroha2/data-model:

  import { TransactionPayload, OptionU32, MapNameValue } from '@iroha2/data-model'
  
  const payload = TransactionPayload({
    instructions: executable,
    time_to_live_ms: 100_000n,
    nonce: OptionU32('None'),
    metadata: MapNameValue(new Map()),
    creation_time: BigInt(Date.now()),
    account_id: accountId,
  })
  

• signTransactionPayload - this could be exposed easily. Currently Client.submit() does it internally.

• submitVersionedTransaction - this could be exposed from Client as well.

[s8sato]

The transaction lifecycle feature will affect the implementation of this issue

[0x009922]

I close this issue after merging of #124.

• You can scaffold a transaction payload with a new helper for it - makeTransactionPayload()
• You can make signature of a transaction in 2 ways:
  • signTransaction(payload) returns Signature
  • makeSignedTransaction(payload, signer) returns signed VersionedTransaction
• Torii.transaction(tx) literally only submits VersionedTransaction