Only import climate_ref when type checking to avoid making it a dependency

Author: bouweandela

packages/climate-ref-pmp/src/climate_ref_pmp/__init__.py

@@ -2,16 +2,21 @@
 Rapid evaluating CMIP data
 """
 
+from __future__ import annotations
+
 import importlib.metadata
 import os
+from typing import TYPE_CHECKING
 
 from loguru import logger
 
-from climate_ref.config import Config
 from climate_ref_core.dataset_registry import DATASET_URL, dataset_registry_manager
 from climate_ref_core.providers import CondaDiagnosticProvider
 from climate_ref_pmp.diagnostics import ENSO, AnnualCycle, ExtratropicalModesOfVariability
 
+if TYPE_CHECKING:
+    from climate_ref.config import Config
+
 __version__ = importlib.metadata.version("climate-ref-pmp")