Let AnnotatedTopology have a VertexFinder attached

Annotators may want to match vertices based on partial information.
Especially, with split visualisation.ospf, we want to be able to match
for networks even without the full details (like DRs or all the
current prefixes.)

This finally uses the VertexFinder :-) Also, it is definitely not a
dataclass, who wrote that? ;-)

birdvisu/annotations/__init__.py

@@ -22,7 +22,7 @@ indirections to iterating over all annotation of a particular vertex/edge. We
 believe that the latter is less common operation, so this seems like a good
 approach."""
 
-from ..topo_v3 import TopologyV3, VertexID, Edge
+from ..topo_v3 import TopologyV3, VertexID, Edge, VertexFinder
 from collections import defaultdict
 from collections.abc import Hashable
 from dataclasses import dataclass, field
@@ -33,6 +33,8 @@ class AnnotatedTopology:
 	def __init__(self, topology):
 		if not topology.frozen: raise ValueError('Can only annotate frozen topologies.')
 		self.topology = topology
+		self.finder = VertexFinder()
+		self.finder.add_topology(topology)
 		self.annotations: dict['AnnotatorID', 'Annotation'] = dict()
 		# Keeping track of dependencies
 		self.running_annotations = set()

birdvisu/topo_v3.py

@@ -235,7 +235,6 @@ class Edge:
 	# adding them to a topology.
 	virtual: bool = False
 
-@dataclass
 class VertexFinder:
 	"""Tracker of presence of vertices in topologies.