Add ability for NestedFields to retrieve objects deeply nested multiple levels

• Type: Story
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: 7.1.X, 7.2.10 DXP FP2, 7.2.10.1 DXP SP1, 7.2.X, Master
• Component/s: Headless Delivery API
• Labels:
  • headless-opt-out
  • liferay-dxp-72-sp1
  • liferay-fixpack-dxp-2-7210
• Branch Version/s:
  7.2.x, 7.1.x
• Backported to Branch:
  Committed
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/77204

If Object A has a nested field Object B, it would also be useful if we could retrieve nested objects under Object B and so on.

For example:

curl http://localhost/o/rest/v1.0/object-a?nestedFields=object-b,object-b.object-c

Object A {
	..regular fields..
	Object B {
		Object C {
			...
		}
	}
}