Create AccountUsers GET and POST endpoints

• Type: Technical Task
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: Master
• Component/s: User Management
• Labels: None
• Sprint: U&SM| S03 Sprint15| 1.21-2.4, U&SM| S03 Sprint16| 2.4-2.18, U&SM| S03 Sprint 17 | 2.18-3.3, U&SM| S03 Sprint 18 | 3.3-3.17, U&SM| S03 Sprint 19 |3.17-3.31, U&SM| S03 Sprint 20 |3.31-4.14
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/84964

• Create AccountUsers GET and POST endpoints
• AccountUser shape
• POST add account user
• GET account users