chore: move all Llama Stack types from llama-models to llama-stack (#1098)

llama-models should have extremely minimal cruft. Its sole purpose
should be didactic -- show the simplest implementation of the llama
models and document the prompt formats, etc.

This PR is the complement to
https://github.com/meta-llama/llama-models/pull/279

## Test Plan

Ensure all `llama` CLI `model` sub-commands work:

```bash
llama model list
llama model download --model-id ...
llama model prompt-format -m ...
```

Ran tests:
```bash
cd tests/client-sdk
LLAMA_STACK_CONFIG=fireworks pytest -s -v inference/
LLAMA_STACK_CONFIG=fireworks pytest -s -v vector_io/
LLAMA_STACK_CONFIG=fireworks pytest -s -v agents/
```

Create a fresh venv `uv venv && source .venv/bin/activate` and run
`llama stack build --template fireworks --image-type venv` followed by
`llama stack run together --image-type venv` <-- the server runs

Also checked that the OpenAPI generator can run and there is no change
in the generated files as a result.

```bash
cd docs/openapi_generator
sh run_openapi_generator.sh
```

llama_stack/providers/tests/agents/test_agents.py

@@ -7,8 +7,6 @@
 import os
 
 import pytest
-from llama_models.datatypes import SamplingParams, TopPSamplingStrategy
-from llama_models.llama3.api.datatypes import BuiltinTool
 
 from llama_stack.apis.agents import (
     AgentConfig,
@@ -25,6 +23,7 @@ from llama_stack.apis.agents import (
 )
 from llama_stack.apis.inference import CompletionMessage, UserMessage
 from llama_stack.apis.safety import ViolationLevel
+from llama_stack.models.llama.datatypes import BuiltinTool, SamplingParams, TopPSamplingStrategy
 from llama_stack.providers.datatypes import Api
 
 # How to run this test:

llama_stack/providers/tests/inference/groq/test_groq_utils.py

@@ -23,8 +23,6 @@ from groq.types.chat.chat_completion_message_tool_call import (
     Function,
 )
 from groq.types.shared.function_definition import FunctionDefinition
-from llama_models.datatypes import GreedySamplingStrategy, TopPSamplingStrategy
-from llama_models.llama3.api.datatypes import ToolParamDefinition
 
 from llama_stack.apis.common.content_types import ToolCallParseStatus
 from llama_stack.apis.inference import (
@@ -38,6 +36,7 @@ from llama_stack.apis.inference import (
     ToolDefinition,
     UserMessage,
 )
+from llama_stack.models.llama.datatypes import GreedySamplingStrategy, ToolParamDefinition, TopPSamplingStrategy
 from llama_stack.providers.remote.inference.groq.groq_utils import (
     convert_chat_completion_request,
     convert_chat_completion_response,

llama_stack/providers/tests/inference/test_prompt_adapter.py

@@ -6,19 +6,18 @@
 
 import unittest
 
-from llama_models.llama3.api.datatypes import (
-    BuiltinTool,
-    ToolDefinition,
-    ToolParamDefinition,
-    ToolPromptFormat,
-)
-
 from llama_stack.apis.inference import (
     ChatCompletionRequest,
     SystemMessage,
     ToolConfig,
     UserMessage,
 )
+from llama_stack.models.llama.datatypes import (
+    BuiltinTool,
+    ToolDefinition,
+    ToolParamDefinition,
+    ToolPromptFormat,
+)
 from llama_stack.providers.utils.inference.prompt_adapter import (
     chat_completion_request_to_messages,
 )

llama_stack/providers/tests/inference/test_text_inference.py

@@ -6,14 +6,6 @@
 
 
 import pytest
-from llama_models.llama3.api.datatypes import (
-    SamplingParams,
-    StopReason,
-    ToolCall,
-    ToolDefinition,
-    ToolParamDefinition,
-    ToolPromptFormat,
-)
 from pydantic import BaseModel, ValidationError
 
 from llama_stack.apis.common.content_types import ToolCallParseStatus
@@ -30,6 +22,14 @@ from llama_stack.apis.inference import (
     UserMessage,
 )
 from llama_stack.apis.models import ListModelsResponse, Model
+from llama_stack.models.llama.datatypes import (
+    SamplingParams,
+    StopReason,
+    ToolCall,
+    ToolDefinition,
+    ToolParamDefinition,
+    ToolPromptFormat,
+)
 
 from .utils import group_chunks
 

llama_stack/providers/tests/report.py

@@ -9,11 +9,12 @@ from collections import defaultdict
 from pathlib import Path
 
 import pytest
-from llama_models.datatypes import CoreModelId
-from llama_models.sku_list import all_registered_models
 from pytest import ExitCode
 from pytest_html.basereport import _process_outcome
 
+from llama_stack.models.llama.datatypes import CoreModelId
+from llama_stack.models.llama.sku_list import all_registered_models
+
 INFERENCE_APIS = ["chat_completion"]
 FUNCTIONALITIES = ["streaming", "structured_output", "tool_calling"]
 SUPPORTED_MODELS = {