[patches] misc minor fixes to streaming swaps #check-lint-warning

1. The StreamingSwapMinBPFee calculation isn't correct. It currently gives half the fees than it should.
2. a trade target of /1 should assume zero for the trade target, instead of a refund
3. Add expected_amount_out_streaming for streaming swaps
4. estimated blocks/seconds is over estimated. This is because the first swap is immediate
5. Add new quotes query arg for streaming_quantity. The sample memo in the quotes endpoint shouldn't include a streaming swap quantity unless specified