Define kD/TPR-Tree data associators for existing associators

[sdhiscocks]

The tree mixins are useful to enable using the tree structures on different, but current data associators require definition with mixins every time you want to use them. I think we could just include them in the stonesoup.dataassocaitor.tree.

Definitions are already present in tests:

Stone-Soup/stonesoup/dataassociator/tests/test_tree.py

Lines 27 to 70 in bfbe6ec

	class DetectionKDTreeNN(DetectionKDTreeMixIn, NearestNeighbour):
	"""DetectionKDTreeNN from NearestNeighbour and DetectionKDTreeMixIn"""
	pass
	class DetectionKDTreeGNN(DetectionKDTreeMixIn, GlobalNearestNeighbour):
	"""DetectionKDTreeGNN from GlobalNearestNeighbour and DetectionKDTreeMixIn"""
	pass
	class DetectionKDTreeGNN2D(DetectionKDTreeMixIn, GNNWith2DAssignment):
	"""DetectionKDTreeGNN2D from GNNWith2DAssignment and DetectionKDTreeMixIn"""
	pass
	class TPRTreeNN(TPRTreeMixIn, NearestNeighbour):
	"""TPRTreeNN from NearestNeighbour and TPRTreeMixIn"""
	pass
	class TPRTreeGNN(TPRTreeMixIn, GlobalNearestNeighbour):
	"""TPRTreeGNN from GlobalNearestNeighbour and TPRTreeMixIn"""
	pass
	class TPRTreeGNN2D(TPRTreeMixIn, GNNWith2DAssignment):
	"""TPRTreeGNN2D from GNNWith2DAssignment and TPRTreeMixIn"""
	pass
	class KDTreePDA(DetectionKDTreeMixIn, PDA):
	pass
	class KDTreeJPDA(DetectionKDTreeMixIn, JPDA):
	pass
	class TPRTreePDA(TPRTreeMixIn, PDA):
	pass
	class TPRTreeJPDA(TPRTreeMixIn, JPDA):
	pass

[sdhiscocks]

Resolved with #771