[ENH] V1 → V2 API Migration - estimation procedures

openml/_api/__init__.py

@@ -0,0 +1,8 @@
+from openml._api.runtime.core import APIContext
+
+
+def set_api_version(version: str, *, strict: bool = False) -> None:
+    api_context.set_version(version=version, strict=strict)
+
+
+api_context = APIContext()

openml/_api/clients/__init__.py

@@ -0,0 +1,6 @@
+from .http import HTTPCache, HTTPClient
+
+__all__ = [
+    "HTTPCache",
+    "HTTPClient",
+]