Incorrect ArrayPool usage

[MihaZupan]

Service

OpenAI

Describe the bug

There are a number of places where pooled buffers will never be returned:

• openai-dotnet/src/Custom/RealtimeConversation/Internal/AsyncWebsocketMessageEnumerator.cs

  Line 23 in c046c34

  _receiveBuffer = ArrayPool<byte>.Shared.Rent(1024 * 18);

• openai-dotnet/src/Custom/RealtimeConversation/RealtimeConversationSession.cs

  Line 60 in c046c34

  byte[] buffer = ArrayPool<byte>.Shared.Rent(1024 * 16);

• openai-dotnet/src/Custom/RealtimeConversation/RealtimeConversationSession.cs

  Line 98 in c046c34

  byte[] buffer = ArrayPool<byte>.Shared.Rent(1024 * 16);

• openai-dotnet/tests/RealtimeConversation/ConversationTests.cs

  Line 342 in c046c34

  byte[] audioSendBuffer = ArrayPool<byte>.Shared.Rent(audioSendBufferLength);

• The buffer won't be returned on invalid data:
  

  openai-dotnet/src/Custom/Embeddings/OpenAIEmbedding.cs

  Lines 120 to 124 in c046c34

  	byte[] bytes = ArrayPool<byte>.Shared.Rent(Base64.GetMaxDecodedFromUtf8Length(base64.Length));
  	OperationStatus status = Base64.DecodeFromUtf8(base64, bytes.AsSpan(), out int bytesConsumed, out int bytesWritten);
  	if (status != OperationStatus.Done || bytesWritten % sizeof(float) != 0)
  	{
  	ThrowInvalidData();

Steps to reproduce

N/A

Code snippets

No response

OS

N/A

.NET version

N/A

Library version

current main branch