fix: rename llama_stack_api dir (#4155)

# What does this PR do?

the directory structure was src/llama-stack-api/llama_stack_api

instead it should just be src/llama_stack_api to match the other
packages.

update the structure and pyproject/linting config

---------

Signed-off-by: Charlie Doern <cdoern@redhat.com>
Co-authored-by: Ashwin Bharambe <ashwin.bharambe@gmail.com>

tests/unit/server/test_access_control.py

@@ -8,12 +8,12 @@ from unittest.mock import MagicMock, Mock, patch
 
 import pytest
 import yaml
-from llama_stack_api import Api, ModelType
 from pydantic import TypeAdapter, ValidationError
 
 from llama_stack.core.access_control.access_control import AccessDeniedError, is_action_allowed
 from llama_stack.core.datatypes import AccessRule, ModelWithOwner, User
 from llama_stack.core.routing_tables.models import ModelsRoutingTable
+from llama_stack_api import Api, ModelType
 
 
 class AsyncMock(MagicMock):

tests/unit/server/test_resolver.py

@@ -9,7 +9,6 @@ import sys
 from typing import Any, Protocol
 from unittest.mock import AsyncMock, MagicMock
 
-from llama_stack_api import Inference, InlineProviderSpec, ProviderSpec
 from pydantic import BaseModel, Field
 
 from llama_stack.core.datatypes import Api, Provider, StackRunConfig
@@ -27,6 +26,7 @@ from llama_stack.core.storage.datatypes import (
 )
 from llama_stack.providers.utils.kvstore import register_kvstore_backends
 from llama_stack.providers.utils.sqlstore.sqlstore import register_sqlstore_backends
+from llama_stack_api import Inference, InlineProviderSpec, ProviderSpec
 
 
 def add_protocol_methods(cls: type, protocol: type[Protocol]) -> None:

tests/unit/server/test_sse.py

@@ -9,9 +9,9 @@ import logging  # allow-direct-logging
 from unittest.mock import AsyncMock, MagicMock
 
 import pytest
-from llama_stack_api import PaginatedResponse
 
 from llama_stack.core.server.server import create_dynamic_typed_route, create_sse_event, sse_generator
+from llama_stack_api import PaginatedResponse
 
 
 @pytest.fixture