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Consider minLength, maxLength and pattern in referenced schema

Merged Administrator requested to merge min_max_pattern_fix into master

Created by: jmini

Reported by @FatCash on https://github.com/swagger-api/swagger-codegen/issues/8001

OAS2 example:

definitions:
  SomeObj:
    type: object
    properties:
      nick:
        $ref: "#/definitions/NickName"
  NickName:
    type: string
    minLength: 1
    maxLength: 3
    pattern: "^[A-Z]+$"

The solution proposed here is really temporary. When we will work on #20, I think that a lot of the methods in DefaultCodegen will be refactored. For example the OpenAPI instance will be propagated everywhere instead of Map<String, Schema>. This way we can use ModelUtils to resolve referenced Schema consistently.