Advanced-Accounts-Accounts creation, update and liquidation

Number of APIs: 6

1. Create account POST {{proxiedPublicURL}}/accounts

2. List user accounts GET {{proxiedPublicURL}}/users/{{latestUserID}}/accounts

3. Retrieve an account GET {{proxiedPublicURL}}/accounts/{{advancedAccountID}}

4. Update an account PATCH {{proxiedPublicURL}}/accounts/{{advancedAccountID}}

5. Account closure DELETE {{proxiedPublicURL}}/accounts/{{advancedAccountID}}

6. List accounts GET {{proxiedPublicURL}}/accounts