[ENH] Implement Proximity Tree classifier using aeon distances

aeon/classification/distance_based/__init__.py

@@ -1,11 +1,9 @@
 """Distance based time series classifiers."""
 
-__all__ = [
-    "ElasticEnsemble",
-    "KNeighborsTimeSeriesClassifier",
-]
+__all__ = ["ElasticEnsemble", "KNeighborsTimeSeriesClassifier", "ProximityTree"]
 
 from aeon.classification.distance_based._elastic_ensemble import ElasticEnsemble
+from aeon.classification.distance_based._proximity_tree import ProximityTree
 from aeon.classification.distance_based._time_series_neighbors import (
     KNeighborsTimeSeriesClassifier,
 )