Adds Kubernetes sandbox provisioner support (#35)

* Adds Kubernetes sandbox provisioner support

* Improves Docker dev setup by standardizing host paths

Replaces hardcoded host paths with a configurable root directory,
making the development environment more portable and easier to use
across different machines. Automatically sets the root path if not
already defined, reducing manual setup steps.

backend/src/community/aio_sandbox/__init__.py

@@ -1,4 +1,19 @@
 from .aio_sandbox import AioSandbox
 from .aio_sandbox_provider import AioSandboxProvider
+from .backend import SandboxBackend
+from .file_state_store import FileSandboxStateStore
+from .local_backend import LocalContainerBackend
+from .remote_backend import RemoteSandboxBackend
+from .sandbox_info import SandboxInfo
+from .state_store import SandboxStateStore
 
-__all__ = ["AioSandbox", "AioSandboxProvider"]
+__all__ = [
+    "AioSandbox",
+    "AioSandboxProvider",
+    "FileSandboxStateStore",
+    "LocalContainerBackend",
+    "RemoteSandboxBackend",
+    "SandboxBackend",
+    "SandboxInfo",
+    "SandboxStateStore",
+]