rename from "cognitive-search" to "azure-ai-search"

[apc-kamezaki]

Azure Cognitive Search was rebranded to Azure AI Search on November 2023.
https://learn.microsoft.com/en-us/azure/search/whats-new#new-service-name

We should rewrite the document and rename the npm package name.

[apc-kamezaki]

how to rename published npm module
https://stackoverflow.com/questions/28371669/renaming-a-published-npm-module