Codemod from llama_toolchain -> llama_stack

- added providers/registry
- cleaned up api/ subdirectories and moved impls away
- restructured api/api.py
- from llama_stack.apis.<api> import foo should work now
- update imports to do llama_stack.apis.<api>
- update many other imports
- added __init__, fixed some registry imports
- updated registry imports
- create_agentic_system -> create_agent
- AgenticSystem -> Agent

llama_stack/cli/llama.py

@@ -31,16 +31,6 @@ class LlamaCLIParser:
         ModelParser.create(subparsers)
         StackParser.create(subparsers)
 
-        # Import sub-commands from agentic_system if they exist
-        try:
-            from llama_agentic_system.cli.subcommand_modules import SUBCOMMAND_MODULES
-
-            for module in SUBCOMMAND_MODULES:
-                module.create(subparsers)
-
-        except ImportError:
-            pass
-
     def parse_args(self) -> argparse.Namespace:
         return self.parser.parse_args()