Changes to Published public-dataset counters

the response property total_persons_approx became nullable for the status 200

api operation id getStats was added

the endpoint scheme security apiKey was added to the API

the endpoint scheme security bearerAuth was added to the API

added the new optional header request parameter If-None-Match

added the non-success response with the status 304

added the non-success response with the status 429

added the non-success response with the status 503

the response property built_at became required for the status 200

the response property timestamp became required for the status 200

the response property total_companies became required for the status 200

the response property total_persons_approx became required for the status 200

the response property version became required for the status 200

the version response property const value 1.2 was added for the status 200

added the required property count_source to the response with the 200 status

added the required property person_count_source to the response with the 200 status

added the required property person_public_source_generation to the response with the 200 status