feat(runs): add `additionalInstructions` property to `RunRequest` (#293) #477

Job	Run time
Lint	55s
Test JVM (Assistants, *.TestAssistants)	1m 43s
Test JVM (Audio, *.TestAudio)	1m 31s
Test JVM (Chat Completions, .TestChat)	1m 40s
Test JVM (Embeddings, *.TestEmbeddings)	1s
Test JVM (Files, *.TestFiles)	1m 50s
Test JVM (Fine-tuning, *.TestFineTuning)	30s
Test JVM (Images, *.TestImages)	1s
Test JVM (Messages, *.TestMessages)	1s
Test JVM (Models, *.TestModels)	1s
Test JVM (Moderations, *.TestModerations)	1s
Test JVM (Runs, *.TestRuns)	1s
Test JVM (Threads, *.TestThreads)	1s
Test JVM (Misc., .misc.)	1s
publish-docs	0s
	8m 17s

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