feat: support conditional operators

[AlexVarchuk]

What/Why/How?

add support conditional operators for openApi 3.1. Add supporting x-displayName for if/else.

Reference

properties:
  photoUrls:
    description: The list of URL to a cute photos featuring pet
    type: [string, integer, 'null', array]
    xml:
      name: photoUrl
      wrapped: true
    items:
      type: string
      format: url
    if:
      x-displayName: isString
      type: string
    then:
      minItems: 1
      maxItems: 10
    else:
      x-displayName: notString
      type: [integer, 'null', array]
      minItems: 1
      maxItems: 20

properties:
  userStatus:
    description: User status
    type: integer
    format: int32
if:
  title: userStatus === 10
  properties:
    userStatus:
      enum: [10]
then:
  required: ['phone']
else:
  required: []

Testing

Screenshots (optional)

Check yourself

• Code is linted
• Tested
• All new/updated code is covered with tests

[AlexVarchuk]

after merge #1942 unit test should be passed