Fix MyPy type errors for aembedding call_type (BerriAI#16360)

Add "aembedding" to Literal type hints in ProxyLogging methods:
- pre_call_hook overloads (lines 872, 893, 913)
- during_call_hook (line 1052)
- _process_guardrail_callback (line 803)

Add type: ignore comments where ProxyLogging calls CustomLogger
callbacks (lines 1021, 1106) to handle type mismatch between
ProxyLogging's broader Literal (includes "aembedding") and
CustomLogger's narrower Literal (doesn't include "aembedding").

Related to PR BerriAI#16328 which changed embeddings endpoint to use
call_type="aembedding" for async operations.

Author: Chesars

litellm/proxy/utils.py

@@ -800,6 +800,7 @@ async def _process_guardrail_callback(
             "completion",
             "text_completion",
             "embeddings",
+            "aembedding",
             "image_generation",
             "moderation",
             "audio_transcription",
@@ -869,6 +870,7 @@ async def pre_call_hook(
             "completion",
             "text_completion",
             "embeddings",
+            "aembedding",
             "image_generation",
             "moderation",
             "audio_transcription",
@@ -889,6 +891,7 @@ async def pre_call_hook(
             "completion",
             "text_completion",
             "embeddings",
+            "aembedding",
             "image_generation",
             "moderation",
             "audio_transcription",
@@ -908,6 +911,7 @@ async def pre_call_hook(
             "completion",
             "text_completion",
             "embeddings",
+            "aembedding",
             "image_generation",
             "moderation",
             "audio_transcription",
@@ -1014,7 +1018,7 @@ async def pre_call_hook(
                         user_api_key_dict=user_api_key_dict,
                         cache=self.call_details["user_api_key_cache"],
                         data=data,  # type: ignore
-                        call_type=call_type,
+                        call_type=call_type,  # type: ignore
                     )
                     if response is not None:
                         data = await self.process_pre_call_hook_response(
@@ -1046,6 +1050,7 @@ async def during_call_hook(
             "completion",
             "responses",
             "embeddings",
+            "aembedding",
             "image_generation",
             "moderation",
             "audio_transcription",
@@ -1098,7 +1103,7 @@ async def during_call_hook(
                     callback.async_moderation_hook(
                         data=data,
                         user_api_key_dict=user_api_key_auth_dict,  # type: ignore
-                        call_type=call_type,
+                        call_type=call_type,  # type: ignore
                     )
                 )