ENH: Log training time in core.train, fix #2

src/vak/core/train.py

@@ -2,6 +2,7 @@
 import logging
 import pathlib
 import shutil
+import time
 
 import joblib
 
@@ -361,8 +362,16 @@ def train(
         default_callback_kwargs=default_callback_kwargs,
         device=device,
     )
+    train_start_time = time.time()
+    logger.info(
+        f"Training start time: {train_start_time}"
+    )
     trainer.fit(
         model=model,
         train_dataloaders=train_loader,
         val_dataloaders=val_loader,
     )
+    elapsed = time.time() - train_start_time
+    logger.info(
+        f"Elapsed training time: {elapsed}"
+    )