Remove propagator options from vertexing configs and performance upgrades

This MR

• removes the propagator options from all tool configs and creates them instead just before invoking the propagator: In general, the context objects needed for creating the tool configs are not available at the time of tool instantiation and could potentially vary event by event. Therefore all methods relying on the propagator now take GeometryContext and MagneticFieldContext objects as input and create the propagator options on the fly.
• merges VertexFitterOptions and VertexFinderOptions to VertexingOptions as they were identical and no differentiation between them is needed. It also avoid some useless copying where VertexFinderOptions were converted into VertexFitterOptions.
• Completely orthogonal to the two items above (but happened to land in the same MR, sorry): Updates the implementation of the AnnealingTool to make it computationally more efficient.