Add support for RapidWright

[tmichalak]

The target is to be able to measure the performance of various routing algorithms done with the help of RapidWright. However, first we need to integrate RW with the fpga-tool-perf.

[tmichalak]

@clavin-xlnx could you please update the description and add more details and describe which algorithms you would like to add?

[clavin-xlnx]

RapidWright has a router called RWRoute. It only supports UltraScale+ devices and can be run in both timing-driven and non-timing-driven modes and depends on the design being fully placed (and intra-site nets are routed). From what I remember, nextpnr-interchange does not yet have the ability to output a placed (but not routed) design yet. So, to run RWRoute, the design would need to be unrouted first. For example, if a from nextpnr-interchange was placed and routed and saved as an Interchange fileset, RWRoute could be run with the following RapidWright code:

        EDIFNetlist netlist = LogNetlistReader.readLogNetlist(logNetlistFileName);
        Design design = PhysNetlistReader.readPhysNetlist(physNetlistFileName, netlist);

        // TODO - Remove once nextpnr can export placed-only design
        design.unrouteDesign();

        RWRoute.routeDesignFullNonTimingDriven(design);
        // Timing-driven option: RWRoute.routeDesignFullTimingDriven(design);