Update the test architecture to handle JSON config

lustrec_tests/minimal_tests_wo_optimizations/SYNAPSE_1.lus

...s/minimal_tests_wo_optimizations/UnitDelay_PP.LUSTREC.lus

lustrec_tests/minimal_tests_wo_optimizations/_6counter.lus

lustrec_tests/minimal_tests_wo_optimizations/clocks1.lus

lustrec_tests/minimal_tests_wo_optimizations/dune

...rec_tests/minimal_tests_wo_optimizations/hysteresis_1.lus

lustrec_tests/minimal_tests_wo_optimizations/ignored

...ests/minimal_tests_wo_optimizations/inv_M_2x2.LUSTREC.lus

lustrec_tests/minimal_tests_wo_optimizations/test.ml

...rec_tests/minimal_tests_wo_optimizations/two_counters.lus

lustrec_tests/offline_tests/config.json

lustrec_tests/offline_tests/dune

lustrec_tests/offline_tests/dune

lustrec_tests/stopwatch_test/config.json

lustrec_tests/stopwatch_test/dune

lustrec_tests/stopwatch_test/simple_stopwatch.lus

lustrec_tests/stopwatch_test/test.ml

lustrec_tests/stopwatch_test_O1/dune

lustrec_tests/stopwatch_test_O1/ignored

lustrec_tests/stopwatch_test_O1/test.ml