Provide a way to submit TXs without using subscriptions

[arboleya]

According to @LuizAsFight:

• The Fuel Wallet does the sendTransaction which calls submitAndAwaitStatus on ts sdk side. Then the wallet just gets the transaction id , returns do the dapp and abruptly closes the wallet popup, not waiting for anything from this subscription anymore. could we have a way to submit a transaction that doesn't open a sub and instead just submit the tx? in the wallet use cases we dont need to wait for anything.

Follow-up issue:

• Improve GraphQL subscriptions handling #3684

[danielbate]

We used to use the submit operation, and submitAndAwait would be opt in via an awaitExecution flag on sendTransaction.

The submit endpoint still exists on the client:

submit(
  tx: HexString!
): Transaction!

We could reimplement the reverse functionality, making the subscription opt out?

[Voxelot]

Since the default behavior is to have a subscription right now, it seems like it would be a breaking change if the default is only a submit.

[danielbate]

@Voxelot agreed and we won't change the default behaviour, this will be optional. Ideally most consumers will still use the submitAndAwaitStatus route as that will use the smallest number of requests from submission -> summary.

I'd expect something like the below snippet:

    // Default behaviour
    const { waitForResult } = await wallet.sendTransaction(txRequest); // 1 request via `submitAndAwaitStatus`
    const result = await waitForResult(); // 0 requests to assemble summary, previous subscription used

    // `subscribe: false`
    const { waitForResult } = await wallet.sendTransaction(txRequest, { subscribe: false }); // 1 request made via `submit`
    const result = await waitForResult(); // 1 request made to `statusChange` to assemble summary