[BUG][Typescript] Invalid type for the enum array

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

Array of enums causes compilation error:

        index:
          type: array
          items:
              type: string
              enum:
                - "1"
                - "1"
                - "-1"

error:

public property ''index'' of exported class has or is using private name 'InnerEnum'.

31     'index'?: Array<{ [key: InnerEnum]: InnerEnum; }>;

openapi-generator version

both master and latest release.

OpenAPI declaration file content or url

Generation Details

Generator typescript.

Steps to reproduce

Run generator for schema above.

Related issues/PRs

Suggest a fix

datatypeWithEnum is not set properly in model:
https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/resources/typescript/model/model.mustache#L22

Start with modules/openapi-generator/src/main/resources/typescript/model/model.mustache at the referenced line, then generate a TypeScript model from the enum-array schema in the issue. Check the generated declaration and run the relevant generator tests or compilation checks. Done means the generated model compiles without the private-name error and represents the enum array correctly.