chore(telemetry): code cleanup (#3897)

# What does this PR do?
Clean up telemetry code since the telemetry API has been remove.
- moved telemetry files out of providers to core
- removed from Api

## Test Plan

❯ OTEL_SERVICE_NAME=llama_stack
OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4318 uv run llama stack run
starter
❯ curl http://localhost:8321/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-4o-mini",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ]
  }'

-> verify traces in Grafana

CI

llama_stack/log.py

@@ -9,15 +9,23 @@ import os
 import re
 from logging.config import dictConfig  # allow-direct-logging
 
+from pydantic import BaseModel, Field
 from rich.console import Console
 from rich.errors import MarkupError
 from rich.logging import RichHandler
 
-from llama_stack.core.datatypes import LoggingConfig
-
 # Default log level
 DEFAULT_LOG_LEVEL = logging.INFO
 
+
+class LoggingConfig(BaseModel):
+    category_levels: dict[str, str] = Field(
+        default_factory=dict,
+        description="""
+Dictionary of different logging configurations for different portions (ex: core, server) of llama stack""",
+    )
+
+
 # Predefined categories
 CATEGORIES = [
     "core",