feat(batch): add batch APIs #539

Job	Run time
Lint	41s
Test JVM (Assistants, *.TestAssistants)	2m 18s
Test JVM (Audio, *.TestAudio)	2m 38s
Test JVM (Chat Completions, .TestChat)	3m 32s
Test JVM (Embeddings, *.TestEmbeddings)	2m 4s
Test JVM (Files, *.TestFiles)	2m 10s
Test JVM (Fine-tuning, *.TestFineTuning)	1m 32s
Test JVM (Images, *.TestImages)	1m 23s
Test JVM (Messages, *.TestMessages)	1m 2s
Test JVM (Models, *.TestModels)	1s
Test JVM (Moderations, *.TestModerations)	1s
Test JVM (Runs, *.TestRuns)	1s
Test JVM (Threads, *.TestThreads)	1s
Test JVM (Vector Stores, *.TestVectorStores)	1s
Test JVM (Misc., .misc.)	23s
publish-docs	0s
	17m 48s

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