Support mocking

[mleonhard-flexport]

Is your feature request related to a problem? Please describe 🙏
Since Algolia provides nothing like LocalStack for testing, I must write poor tests that mock the Algolia client object. The test must mock partialUpdateObjects. Unfortunately, Kotlin client library uses an extension function which makes mocking very hard. I haven't figured it out yet.

val responseBatch = mockk<ResponseBatch>() {
    every {
        // Unresolved reference: wait
        wait()
    }
}
val updates = slot<List<Pair<ObjectID, Partial>>>()
val index = mockk<Index>() {
    coEvery {
        partialUpdateObjects(
            createIfNotExists = true,
            partials = capture(updates)
        )
    }
}

Describe the solution you'd like 🤔
Remove the need to call wait() and instead make partialUpdateObjects a suspend function.

Describe alternatives you've considered ✨

• Writing a test harness to create an index per test run and delete it afterward. This would be a real integration test.
• Wrapping the Algolia client in a class that can be mocked, with suspend functions.

Additional context
implementation("com.algolia:algoliasearch-client-kotlin:2.1.5")
Kotlin version 1.9.0-release-358 (JRE 20.0.1)
IntelliJ IDEA 2023.2 (Community Edition)
Build #IC-232.8660.185, built on July 25, 2023
Runtime version: 17.0.7+7-b1000.6 aarch64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
macOS 13.5
Non-Bundled Plugins:
Kotlin: 232-1.9.0-IJ8660.185