add optional dependencies for time-series, cec and xgboost

Author: SimonBlanke

pyproject.toml

@@ -45,14 +45,28 @@ viz = [
 ml = [
     "scikit-learn",
 ]
+# CEC benchmark data fetching
+cec = [
+    "pooch>=1.5.0",
+]
+# Time-series functions with sktime
+timeseries = [
+    "surfaces[ml]",
+    "sktime>=0.24.0",
+]
 # Image classification with CNNs (requires tensorflow)
 images = [
     "surfaces[ml]",
     "tensorflow>=2.10.0",
 ]
+# XGBoost-based functions
+xgboost = [
+    "surfaces[ml]",
+    "xgboost>=1.7.0",
+]
 # All optional features
 full = [
-    "surfaces[viz,ml,images]",
+    "surfaces[viz,ml,cec,timeseries,images,xgboost]",
 ]
 # Development
 dev = [