[typescript] Fix uncompilable output when using allOf (#8000)

[ralphpig]

Fixes #8000

Summary

When using allOf, or oneOf with an inline schema, a Union/Intersection type is generated with the primitive object. This results in an invalid import because the composed type of the schema is ignored.

import { BaseObject & object }

Approach

To fix this I used needToImport to removes the language primitives from being imported. This same check already happens in addImport, but not in toModelImportMap.

toModelImportMap splits union types but not intersection types, so I've combined those cases into splitComposedType. For splitComposedType I combined replace(" ","").split("\\|") and split("( [|&] )|[<>]") into replace(" ","").split("[|&<>]"). These should be equivilant regex, and I think stripping the whitespace is good here.

I added the warning in toModelImport strictly because there was already a warning for the union type and wanted to be consistent.

Minimal Reproducible Example

-g typescript-axios --additional-properties=withSeparateModelsAndApi=true,apiPackage=api,modelPackage=models

openapi: 3.0.3

info:
  title: Issue 8000
  version: 1.0.0
  description: Issue 8000 Minimal Reproducible Example

paths:
  /resource:
    get:
      operationId: get_resource
      responses:
        200:
          description: resource
          content:
            application/json:
              schema:
                type: object
                allOf:
                  - $ref: '#/components/schemas/BaseObject'
                  - type: object
                    properties:
                      field:
                        type: string

components:
  schemas:
    BaseObject:
      type: object
      properties:
        id:
          type: integer

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[ralphpig]

Hey, just a gentle bump. If anyone has a few minutes to check this out I would greatly appreciate it.

[amakhrov]

the comment is a bit too narrow - the actual test not only verifies that, but also checks that intersection/union type imports are properly handled in general. maybe reword this somehow?

[amakhrov]

Thanks for your contribution! The fix looks good to me.