Add custom future type, ResponseFuture, for HTTP responses #5148

Job	Run time
Code Style	48s
SDK docs	1m 31s
SDK docs - mgmt	28s
Lint	30s
SDK docs - svc	25s
Get minimum supported rust version	15s
SDK Tests (stable, false)	6m 35s
WASM Tests (stable, false)	4m 48s
SDK Tests (1.76, false)	7m 14s
WASM Tests (1.76, false)	1m 14s
E2E Tests (stable, false)	3m 14s
SDK Tests (nightly, true)	5m 24s
WASM Tests (nightly, true)	6m 25s
E2E Tests (1.76, false)	5m 27s
E2E Tests (nightly, true)	4m 56s
	49m 14s

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