feat: add identity blockstore (#298) #253

Job	Run time	Billable time
js-test-and-release / check	2m 3s	0s
js-test-and-release / test-chrome	56s	0s
js-test-and-release / test-firefox	58s	0s
js-test-and-release / test-chrome-webworker	51s	0s
js-test-and-release / test-firefox-webworker	1m 0s	0s
js-test-and-release / test-node (windows-latest, lts/*)	3m 30s	0s
js-test-and-release / test-webkit (ubuntu-latest, lts/*)	15s	0s
js-test-and-release / test-node (ubuntu-latest, lts/*)	42s	0s
js-test-and-release / test-node (macos-latest, lts/*)	3m 44s	0s
js-test-and-release / test-electron-main	43s	0s
js-test-and-release / test-webkit (macos-latest, lts/*)	1m 45s	0s
js-test-and-release / test-electron-renderer	15s	0s
js-test-and-release / test-webkit-webworker (ubuntu-latest, lts/*)	10s	0s
js-test-and-release / test-webkit-webworker (macos-latest, lts/*)	2m 13s	0s
js-test-and-release / release-check	2s	0s
js-test-and-release / release	2m 23s	0s
	21m 30s	0s

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