feat: split API and provider specs into separate llama-stack-api pkg (#3895)

# What does this PR do?

Extract API definitions and provider specifications into a standalone
llama-stack-api package that can be published to PyPI independently of
the main llama-stack server.


see: https://github.com/llamastack/llama-stack/pull/2978 and
https://github.com/llamastack/llama-stack/pull/2978#issuecomment-3145115942

Motivation

External providers currently import from llama-stack, which overrides
the installed version and causes dependency conflicts. This separation
allows external providers to:

- Install only the type definitions they need without server
dependencies
- Avoid version conflicts with the installed llama-stack package
- Be versioned and released independently

This enables us to re-enable external provider module tests that were
previously blocked by these import conflicts.

Changes

- Created llama-stack-api package with minimal dependencies (pydantic,
jsonschema)
- Moved APIs, providers datatypes, strong_typing, and schema_utils
- Updated all imports from llama_stack.* to llama_stack_api.*
- Configured local editable install for development workflow
- Updated linting and type-checking configuration for both packages

Next Steps

- Publish llama-stack-api to PyPI
- Update external provider dependencies
- Re-enable external provider module tests


Pre-cursor PRs to this one:

- #4093 
- #3954 
- #4064 

These PRs moved key pieces _out_ of the Api pkg, limiting the scope of
change here.


relates to #3237 

## Test Plan

Package builds successfully and can be imported independently. All
pre-commit hooks pass with expected exclusions maintained.

---------

Signed-off-by: Charlie Doern <cdoern@redhat.com>

docs/openapi_generator/pyopenapi/generator.py

@@ -16,27 +16,27 @@ from typing import Annotated, Any, Dict, get_args, get_origin, Set, Union
 
 from fastapi import UploadFile
 
-from llama_stack.apis.datatypes import Error
-from llama_stack.strong_typing.core import JsonType
-from llama_stack.strong_typing.docstring import Docstring, parse_type
-from llama_stack.strong_typing.inspection import (
+from llama_stack_api import (
+    Docstring,
+    Error,
+    JsonSchemaGenerator,
+    JsonType,
+    Schema,
+    SchemaOptions,
+    get_schema_identifier,
     is_generic_list,
     is_type_optional,
     is_type_union,
     is_unwrapped_body_param,
+    json_dump_string,
+    object_to_json,
+    parse_type,
+    python_type_to_name,
+    register_schema,
     unwrap_generic_list,
     unwrap_optional_type,
     unwrap_union_types,
 )
-from llama_stack.strong_typing.name import python_type_to_name
-from llama_stack.strong_typing.schema import (
-    get_schema_identifier,
-    JsonSchemaGenerator,
-    register_schema,
-    Schema,
-    SchemaOptions,
-)
-from llama_stack.strong_typing.serialization import json_dump_string, object_to_json
 from pydantic import BaseModel
 
 from .operations import (