Deploy ``RRGraphBuilder`` in RRGraph Clock Builder to replace the use of ``rr_node_indices``#1801

vaughnbetz merged 7 commits intomasterverilog-to-routing/vtr-verilog-to-routing:masterfrom

rr_graph_clock_refactorverilog-to-routing/vtr-verilog-to-routing:rr_graph_clock_refactorCopy head branch name to clipboard