feat(specs): add recommend batch rules endpoint

[raed667]

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🧭 What and Why

Add the endpoint /1/indexes/{indexName}/{model}/recommend/rules/batch to the spec.

Definition can be found here: https://github.com/algolia/doc/blob/master/app_data/api_methods/recommend/recommend_batch_rules.yml

🎟 JIRA Ticket:

Changes included:

• List changes

🧪 Test