refactor(tx-builder): allow building unsigned transactions

[sdbondi]

Description

refactor(tx-builder): allow building unsigned transactions

Motivation and Context

We have a few interfaces for submitting transactions, each of these has several fields that are duplicated across types. Some have missing fields simply because a particular transaction feature is unused. This PR adds the UnsignedTransaction type that is built using the TransactionBuilder and given to a wallet for signing.

We could also build a typescript version of the transaction builder to make building well-formed transactions easy.

This PR also adds an optional field to accept the UnsignedTransaction to the wallet daemon. If not specified, the separate fields are used as before to preserve backward compatibility. The idea would be to remove these later in another PR.

How Has This Been Tested?

Updated some cucumber steps to use this

What process can a PR reviewer use to test or verify this change?

   let transaction = Transaction::builder()
        .fee_transaction_pay_from_component(source_component_address, Amount(1))
        .call_method(source_component_address, "withdraw_confidential", args![
            resource_address,
            withdraw_proof
        ])
        .put_last_instruction_output_on_workspace(b"bucket")
        .call_method(destination_account, "deposit", args![Workspace("bucket")])
        .build_unsigned_transaction();

// Send off to the wallet for signing and submission
    let submit_req = TransactionSubmitRequest {
        transaction: Some(transaction),
       signing_key_index: Some(signing_key_index),
     ..Default::default()
   }

Breaking Changes

• None
• Requires data directory to be deleted
• Other - Please specify

[github-actions]

Test Results (CI)

498 tests  +1   497 ✅ +3   2h 50m 10s ⏱️ + 1m 18s
 60 suites ±0     0 💤 ±0 
  2 files   ±0     1 ❌  - 2 

For more details on these failures, see this check.

Results for commit a7d0329. ± Comparison against base commit f449801.

♻️ This comment has been updated with latest results.