Extracted json request builder method #89

Job	Run time
SDK docs - mgmt	20s
Code Style	1m 15s
Get minimum supported rust version	19s
Lint	29s
SDK docs	1m 19s
SDK docs - svc	20s
SDK Tests (stable, false)	2m 52s
WASM Tests (stable, false)	2m 37s
SDK Tests (1.76, false)	2m 37s
WASM Tests (1.76, false)	2m 23s
SDK Tests (nightly, true)	1m 34s
E2E Tests (stable, false)	1m 47s
WASM Tests (nightly, true)	2m 31s
E2E Tests (1.76, false)	1m 50s
E2E Tests (nightly, true)	1m 52s
	24m 5s

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