Vertex builder class to convert from xAOD into TIDA vertices

Create new class that takes collections or iterators of collections through xAOD vertices and converts them into TIDA vertices for use in vertexing analysis. Optionally can store ids of tracks belonging to vertices alongside the vertices in TrackTrigObjects. The class is intended to clean up repeated code in the analysis configuration file and will eventually be used to convert other types of vertices (e.g. displaced) into the TIDA structure.

Refactor AnalysisConfigMT_Ntuple.cxx to use new class.