feat: integrate AssetsController.addCustomAsset in AddCustomToken flo… #1393

Job	Run time
Expo dev build (main-dev-expo) / prepare	1m 38s
Expo dev build (main-dev-expo) / update-build-version	-1s
Expo dev build (main-dev-expo) / Setup Dependencies (ios) / Setup Node Modules (ios)	4m 8s
Expo dev build (main-dev-expo) / Setup Dependencies (android) / Setup Node Modules (android)	2m 59s
Expo dev build (main-dev-expo) / build (ios)	23m 12s
Expo dev build (main-dev-expo) / build (android)	14m 0s
Expo dev build (main-dev-expo) / Emit build metadata	23s
	46m 19s

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