feat(client-nestjs): create new client-nestjs

[idbenami]

This PR is still WORK-IN-PROGRESS

Create new client-nestjs plugin for @hey-api/openapi-ts package that generates a nestjs module filled with all endpoints as functions in services:

• Generate a NestJS module that encapsulates the OpenAPI client.
• Create services for each OpenAPI tag (controller), allowing developers to interact with the API endpoints.
• Keep the actual request generation logic close to the existing Axios client generator.

closes: #1481

TODO:

• add docs
• handle non-plain-text names (file name, function name...)

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