[BUG] typescript-node uses type "Decimal" for string with format number, but does not generate the type

Bug Report Checklist

[x] Have you provided a full/minimal spec to reproduce the issue?
[x] Have you validated the input using an OpenAPI validator (example)?
[x] Have you tested with the latest master to confirm the issue still exists?
[x] Have you searched for related issues/PRs?
[ ] What's the actual output vs expected output?
[ ] [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Given this value in parameters:

{
            "type": "string",
            "format": "number",
            "description": "Get log lines (example 1000)",
            "name": "lines",
            "in": "query"
}

the generator tries to use this parameter in the functions: lines?: Decimal and imports it like so: import { Decimal } from '../model/decimal';

However, the file model/decimal is never created, so the generate source is invalid.

openapi-generator version

6.1.0

OpenAPI declaration file content or url

Gist

Generation Details

openapi-generator-cli generate -i swagger_new.json -g typescript-node -o generated-sources/openapi --additional-properties=npmName=openApiTest,supportsES6=true,npmVersion=1.0.0

Steps to reproduce

Run the command with an endpoint containing type="string" and format ="number"

OpenAPITools / openapi-generator