Strip whitespaces from column types

[Helveg]

Currently the following entity (among many other types):

import { CreateDateColumn, Entity, PrimaryColumn } from 'typeorm';

@Entity()
export SomeEntity {
  @PrimaryGeneratedColumn('uuid')
  id!: string;

  @CreateDateColumn()
  createdAt!: Date;
}

renders the following invalid mermaid code:

erDiagram
  some_entity {
    character varying id PK
    timestamp without time zone createdAt
  }

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because the type of the id column is rendered as character varying (with whitespace). There's also timestamp without time zone, timestamp with time zone, character varying, double precision, and likely others.