[BUG] AbstractJavaCodegen unable to customize "set" type

[dmivankov]

Description

Extending JavaClientCodegen with

    // import/interface type
    typeMapping().put("set", typeMapping().get("array"));
    // concrete type
    instantiationTypes().put("set", instantiationTypes().get("array"));

and generating schema with arrays with uniqueItems=true sometimes results in compilation error due to missing "ArrayList" import.

openapi-generator version

6.2.0, regression since 5.0.0 (could be even earlier for types other than "set")

OpenAPI declaration file content or url

Command line used for generation

Steps to reproduce

Related issues/PRs

Suggest a fix/enhancement

Use type mappings for "set" everywhere in AbstractJavaCodegen imports.
#13550