SP-ization

[Marsella8]

Description of changes:

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Before merging:

• Did you update the flexflow-third-party repo, if modifying any of the Cmake files, the build configs, or the submodules?

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This change is 

[Marsella8]

Reviewable status: 0 of 78 files reviewed, 1 unresolved discussion (waiting on @lockshaw)

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lib/utils/test/src/utils/graph/series_parallel/sp_ization/spanish_algo.cc line 23 at r1 (raw file):

TEST_SUITE(FF_TEST_SUITE) {
  TEST_CASE("spanish_algo - subcomponents") {
    SUBCASE("add_dummy_nodes") {

how should I test graphs where nodes are added? Here I check for some properties but it's obviously non-exhaustive

[Marsella8]

Reviewable status: 0 of 78 files reviewed, 3 unresolved discussions (waiting on @lockshaw)

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lib/utils/include/utils/graph/series_parallel/sp_ization/work_preserving_sp_ization.h line 64 at r1 (raw file):

 *the SP-ized graph.
 **/
SeriesParallelDecomposition cost_aware_stratum_sync_sp_ization(

old cost-aware algo, will leave it in for benchmarking purposes though we'll probably remove it eventually

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bin/sp_ization_benchmarking/nasnet_bench_graph_generator.h line 1 at r1 (raw file):

// For context, see https://arxiv.org/abs/1902.09635 &&

Benchmarking code is a bit sloppy but it's onyl temporary, should be fine(?)