Server-side batching (SSB)

[bevzzz]

This PR adds BatchContext which implements Server-Side Batching protocol.

List<WeaviateObject<Map<String, Object>>> objects = List.of(...);
List<ObjectReference> references = List.of();
List<CompletableFuture<?>> submitted = new ArrayList<>();

try (BatchContext batch = collection.batch.start()) {
  
  // Optional: Define a retry policy that retries each task up to three times.
  Function<TaskHandle, TaskHandle> retryMax3Times = task -> task
    .result().thenCompose(result -> {
      if (result.error().isEmpty() {
        return result;
      }
      if (task.timesRetried == 3) {
        throw new RuntimeException(result.error().get());
      }
      return retryMax3Times.apply(batch.retry(task));
    });

  // Submit all objects to the batch
  objects.map(batch::add).map(retryMax3Times).forEach(submitted::add);
  
  // Submit all references to the batch
  references.map(batch::add).map(retryMax3Times).forEach(submitted::add;
}

// Await until all tasks complete
CompletableFuture.allOf(submitted).get();

Description

TODO

[orca-security-eu]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca