Reduce number of calls to send txs via connectors

[danielbate]

Note

This may have crossover issues in the connectors repo, still TBD

For a basic transaction, submitted via the FuelConnector, the following network requests are made:

• Estimate gas price
• Dry run
• Get coins to spend
• Submission subscription
• Status subscription
• Get transaction with receipts
• Get latest gas price

Part of this can be mitigated through tx pre bundling (#3495, #3539) and offering less abstract approaches for consumers (#3541), but we should also investigate the source of the problems in our primary flows (call()->waitForResult() etc.) to improve performance for the majority of our consumers.

[danielbate]

The final get latest gas price call to build the summary has now been eliminated in #3559.

Estimating and funding a TX can only be improved from a DX POV, by performing this optimistically. This will be outlined by #3495 where it will implement #3541. This process then builds the result solely from the submitAndAwaitStatus subscription, therefore not needing the status subscription and get tx with receipts call.

However for users that don't use that flow, there is an opportunity to remove a redundant get tx with receipts call if we can return a TransactionResponse from the connectors sendTransaction rather than just the string tx ID. This would be a large breaking change. Will investigate this further as part of this issue. But each flow is represented in a test in #3568.