[extensions] 2/n update asr model parser with input schema

With a new input attachment type `AttachmentDataWithStringValue` defined, This diff updates the ASR Model parser to validate input is in the expected form/type.

Also made some updates to to make input attachment validation clearer.

## Testplan


### Dependencies
Sapling removed the dependency pr. Depends on
#929

extensions/HuggingFace/python/src/aiconfig_extension_hugging_face/local_inference/automatic_speech_recognition.py

@@ -5,7 +5,7 @@
 from aiconfig_extension_hugging_face.local_inference.util import get_hf_model
 from aiconfig import ModelParser, InferenceOptions
 from aiconfig.callback import CallbackEvent
-from aiconfig.schema import Prompt, Output, ExecuteResult, Attachment
+from aiconfig.schema import AttachmentDataWithStringValue, Prompt, Output, ExecuteResult, Attachment, PromptInput
 
 if TYPE_CHECKING:
     from aiconfig import AIConfigRuntime
@@ -154,7 +154,7 @@ def validate_attachment_type_is_audio(attachment: Attachment):
 
 def validate_and_retrieve_audio_from_attachments(prompt: Prompt) -> list[str]:
     """
-    Retrieves the audio uri's from each attachment in the prompt input.
+    Retrieves the audio uri's or base64 from each attachment in the prompt input.
 
     Throws an exception if
     - attachment is not audio
@@ -163,21 +163,24 @@ def validate_and_retrieve_audio_from_attachments(prompt: Prompt) -> list[str]:
     - operation fails for any reason
     """
 
-    if not hasattr(prompt.input, "attachments") or len(prompt.input.attachments) == 0:
+    if not isinstance(prompt.input, PromptInput):
+        raise ValueError(f"Prompt input is of type {type(prompt.input) }. Please specify a PromptInput with attachments for prompt {prompt.name}.")
+
+    if prompt.input.attachments is None or len(prompt.input.attachments) == 0:
         raise ValueError(f"No attachments found in input for prompt {prompt.name}. Please add an audio attachment to the prompt input.")
 
-    audio_uris: list[str] = []
+    audio_inputs: list[str] = []
 
     for i, attachment in enumerate(prompt.input.attachments):
         validate_attachment_type_is_audio(attachment)
 
-        if not isinstance(attachment.data, str):
-            # See todo above, but for now only support uri's
-            raise ValueError(f"Attachment #{i} data is not a uri. Please specify a uri for the audio attachment in prompt {prompt.name}.")
+        if not isinstance(attachment.data, AttachmentDataWithStringValue):
+            raise ValueError(f"""Attachment data must be of type `AttachmentDataWithStringValue` with a `kind` and `value` field. 
+                         Please specify a uri for the audio attachment in prompt {prompt.name}.""")
 
-        audio_uris.append(attachment.data)
+        audio_inputs.append(attachment.data.value)
 
-    return audio_uris
+    return audio_inputs
 
 
 def refine_pipeline_creation_params(model_settings: Dict[str, Any]) -> List[Dict[str, Any]]: