rank added as Config option for ER diagram

[tah96]

Proposal

I've seen in some diagrams (maybe historical) there was a config/directive that allowed "rank" to be passed which helped control the position of nodes/entities in a diagram.

Use case: When an ERD has 5+ entities connected to a single entity via relationships, this can be visually displeasing and get messy. To allow for "moving" of entities to certain levels, the "rank" here would help

Example

---

title: Order example

erDiagram
CUSTOMER ||--o{ ORDER : places
ORDER ||--|{ LINE-ITEM : contains
CUSTOMER }|..|{ MAILING-ADDRESS : uses
CUSTOMER }|..|{ SHIPPING-ADDRESS : uses
CUSTOMER }|..|{ PAYMENT-METHODS : uses
CUSTOMER }|..|{ USER-PROFILE : has

This will show 5 entities below CUSTOMER if dropped in the Live Editor. Would like to make it more true to a "Star" schema where Customer is at its own "level", Mailing-Address and Shipping Address are at its own level, Payment Methods and User-Profile at its own level

Screenshots

No response