Make StateGraph().compile() return CompiledStateGraph rather than CompiledGraph

[Glinte]

Shouldn't be a big change unless from future import annotations is not usable for some reason

# file: langgraph\graph\state.py
from __future__ import annotations

# -- snip --

def compile(
    self,
    checkpointer: Optional[BaseCheckpointSaver] = None,
    interrupt_before: Optional[Union[All, Sequence[str]]] = None,
    interrupt_after: Optional[Union[All, Sequence[str]]] = None,
    debug: bool = False,
) -> CompiledStateGraph:

[hwchase17]

ooc - why would this be helpful?

[Glinte]

Not sure, but it is the correct type to return. Doesn't actually matter for me at runtime, just a small enough change that I feel like I might as well mention it in discussions.

[nfcampos]

Hi, this has been changed