Add record_count to /api/v1/popular-words API Response

[marevol]

We have identified a discrepancy between our OpenAPI specification and the actual implementation of the /api/v1/popular-words endpoint. The record_count field, which is supposed to indicate the number of popular words returned by the API, was missing from the response despite being documented in the OpenAPI definition. This oversight has been rectified by adding the record_count to the API response, aligning our implementation with the documented specification.

The response of the /api/v1/popular-words API now includes a record_count field that reflects the total number of popular words returned.