Update OpenAI tspconfig to include Java emitter config (#23774)

* Update OpenAI tspconfig to include Java emitter config

* remove unions for embedding options

* update docs

Author: srnagar

specification/cognitiveservices/OpenAI.Inference/models/embeddings.create.tsp

@@ -27,14 +27,13 @@ model EmbeddingsOptions {
     "model"?: string;
 
     @doc("""
-    Input text to get embeddings for, encoded as a string.
-    To get embeddings for multiple inputs in a single request, pass an array of strings.
+    Input texts to get embeddings for, encoded as a an array of strings.
     Each input must not exceed 2048 tokens in length.
 
     Unless you are embedding code, we suggest replacing newlines (\\n) in your input with a single space,
     as we have observed inferior results when newlines are present.
     """)
-    input: string | string[];
+    input: string[];
 };
 
 @doc("""

specification/cognitiveservices/OpenAI.Inference/tspconfig.yaml

@@ -14,4 +14,7 @@ options:
   "@azure-tools/typespec-csharp":
     namespace: "Azure.AI.OpenAI"
     clear-output-folder: true
-    model-namespace: false
+    model-namespace: false
+  "@azure-tools/typespec-java":
+    namespace: "com.azure.ai.openai"
+    partial-update: true