WIP 071-ppips rewrite attempt using RapidWright

[hansfbaier]

This is a proof of concept rewrite of the 071-ppips fuzzer using exclusively the ppip data from RapidWright.
Note that the output is considerably smaller than the previous fuzzer,
obviously missing important pieces like below:

[hansfbaier]

The tests of course will all fail, because rapidwright is not available in the CI.
Thus, here is a sample of the results for artix7:
rapidwright-ppips-artix7.tar.gz

[mithro]

Until this data is available through Xilinx in the FPGA Interchange format (https://antmicro.com/blog/2021/09/fpga-interchange-format/), we need to continue to maintain a version of fuzzer which demonstrates the ability to get this data from Vivado (even if a faster version is available through using RapidWright).

BTW You might want to checkout the prjuray fuzzers -- They were written after learning a lot from prjxray and probably a lot cleaner.

[hansfbaier]

@mithro OK, thanks for the info. Will close this PR.

[mithro]

@hansfbaier - We can have a "fast" version that uses RapidWright but we will still need to continue to maintain an equivalent version that uses only Vivadio.

[hansfbaier]

@mithro Not necessary. This is not a priority for me now, as it seemed to break PnR tools as the output was almost an order of magnitude less.