feat: Add OpenAI streaming support with telemetry instrumentation

[fenilfaldu]

📥 Pull Request

closes #1082

📘 Description

• Implemented custom wrappers for OpenAI's Chat Completions and Responses APIs to support streaming functionality.
• Introduced OpenaiStreamWrapper and ResponsesAPIStreamWrapper classes for handling streaming responses and collecting telemetry data.
• Enhanced the OpenaiInstrumentor to include streaming metrics and error handling.
• Updated example scripts to demonstrate streaming usage and added checks for chunk content.
• Refactored chat attribute handling to ensure non-null values are processed correctly.
• Added new span attributes for streaming metrics in span_attributes.py.

🧪 Testing
Tested all the openai examples

[codecov]

Codecov Report

Attention: Patch coverage is 12.44635% with 408 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...instrumentation/providers/openai/stream_wrapper.py	9.11%	399 Missing ⚠️
...s/instrumentation/providers/openai/instrumentor.py	70.00%	6 Missing ⚠️
.../instrumentation/providers/openai/wrappers/chat.py	0.00%	3 Missing ⚠️

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