Python: draft initial implementation of Realtime API

[eavanvalkenburg]

Motivation and Context

Implements the OpenAI Realtime API with Semantic Kernel

Description

Implements a separate Service Client class with its own ExecutionSettings, but still based on ChatCompletionClientBase.
Only support streaming operations with additional public methods for sending data to the conversation.
TBD if that is the way to move forward with it.

TODO:

• lots of comments
• tests
• cleanup

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[markwallace-microsoft]

Python Test Coverage Report •

File	Stmts	Miss	Cover	Missing
semantic_kernel/connectors/ai
chat_completion_client_base.py	127	2	98%	408, 418
function_calling_utils.py	51	10	80%	156–181
realtime_client_base.py	17	4	76%	51–52, 56, 140
semantic_kernel/connectors/ai/open_ai/services
open_ai_realtime.py	17	7	59%	46–58
open_ai_realtime_base.py	229	125	45%	52, 67, 132–144, 150–152, 161–186, 190–275, 285–288, 294–304, 311–314, 323, 337, 351, 365, 387, 396, 405–424, 428–432
open_ai_realtime_utils.py	7	7	0%	3–36
semantic_kernel/contents
function_call_content.py	106	2	98%	197, 225
streaming_chat_message_content.py	71	1	99%	227
TOTAL	16963	1922	89%

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
3000	4 💤	0 ❌	0 🔥	1m 22s ⏱️