Deprecated API: client.Databases.RetrieveAsync

[matkoch]

Describe the bug
API was deprecated

To Reproduce

var notionClient = NotionClientFactory.Create(new ClientOptions
            {
                AuthToken = "accessToken"
            }
var database = await notionClient.Databases.RetrieveAsync("");

Expected behavior
Getting information about the database.

[KoditkarVedant]

@matkoch would you like to contribute? I would be happy to accept the PR.

[Kuzmanov]

Since it's not possible to get all databases from the databases endpoint, and it requires an Id, I think it makes sense to throw an ArgumentNullException when databaseId is not provided.

As an alternative, Notion suggests using the Search API