[BUG] hashmap generator not implemented for typescript

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?

Description

When generating a model with this stucture:

Context:
      title: ApiContextVq
      additionalProperties: true

the instanceOf... and ...toJSON and FromJSONTyped is not implemented instead of anymap... errormap... it just writes the type

if (instanceOf{ [key: string]: any; }(value)) {

openapi-generator version

openapi-generator7.10.0

Suggest a fix

not quite sure what the to json function actually does in javascript.

this is more of an example what the generated code might look like.

function anyHashMapToJSON(value: { [key: string]: any }) {
  return value;
}
function instanceOfAnyHashMap(value: ApiResponseV1Context) {
  return true;
}
function instanceOfErrorHashMap(value: ApiResponseV1Context) {
  return value.every(
    (item: any) =>
      typeof item === "object" &&
      Object.keys(item).every((key) => key === "index" || key === "errors") &&
      (item.index === undefined || typeof item.index === "number") &&
      (item.errors === undefined ||
        (Array.isArray(item.errors) &&
          item.errors.every((err: any) => typeof err === "string"))),
  );
}

Reproduce the TypeScript generation for a model with additionalProperties: true and inspect the generated instanceOf..., ...toJSON, and FromJSONTyped functions. Compare the emitted type-only handling with the requested any-hashmap behavior, then verify that the generated output implements the expected conversions and checks.