Python: [BREAKING] Observability updates (#2782)

* fixes Python: Add env_file_path parameter to setup_observability() similar to AzureOpenAIChatClient
Fixes #2186

* WIP on updates using configure_azure_monitor

* improved setup and clarity

* fixed root .env.example

* revert changes

* updated files

* updated sample

* updated zero code

* test fixes and fixed links

* fix devui

* removed planning docs

* added enable method and updated readme and samples

* clarified docstring

* add return annotation

* updated naming

* update capatilized version

* updated readme and some fixes

* updated decorator name inline with the rest

* feedback from comments addressed

python/packages/anthropic/agent_framework_anthropic/_chat_client.py

@@ -35,7 +35,7 @@ from agent_framework import (
 )
 from agent_framework._pydantic import AFBaseSettings
 from agent_framework.exceptions import ServiceInitializationError
-from agent_framework.observability import use_observability
+from agent_framework.observability import use_instrumentation
 from anthropic import AsyncAnthropic
 from anthropic.types.beta import (
     BetaContentBlock,
@@ -110,7 +110,7 @@ TAnthropicClient = TypeVar("TAnthropicClient", bound="AnthropicClient")
 
 
 @use_function_invocation
-@use_observability
+@use_instrumentation
 @use_chat_middleware
 class AnthropicClient(BaseChatClient):
     """Anthropic Chat client."""