feat: Cache identity responses #1501

Job	Run time
Build Distribution Bundle	42s
Test Jest (16.x)	29s
Test Jest (17.x)	36s
Test Jest (18.x)	29s
Test Jest (19.x)	27s
Test Jest (20.x)	24s
Get Bundle Size from Master	6s
Get Bundle Size from Current Branch	29s
Core Tests / Core SDK Tests	1m 18s
Calculate Bundled Diff / Calculate Bundle Size Difference	8s
Generate Report	1s
Test Stub	30s
Integration Tests: Require JS / Require JS Test	54s
Integration Tests: Rollup Common JS / Rollup CJS Test	1m 11s
Integration Tests: webpack Common JS / webpack CJS Test	1m 8s
Integration Tests: Browserfy Common JS / Browserfy CJS Test	1m 0s
Integration Tests: Rollup Module JS / Rollup Module Test	1m 1s
Integration Tests: webpack Module JS / webpack Module Test	1m 4s
Save PR Number for Dependabot Automerge / Save PR Number for Dependabot Automerge	0s
	11m 57s

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