Refactor test.cpp (#7487)

* Add timing command to cmakelist

* Start to split test.cpp. Move flexbuffers tests

* Move monster related tests to own file

* Move parser related tests to own file

* Move json related tests to own file

* Move proto related tests to own file

* moved more functions to parser test

* moved more functions to parser test2

* move monster extra tests to monster test

* move evolution tests to own file

* move reflection tests to own file

* move util tests to own file

* rehomed various tests

* move optional scalars test to own file:

* rehome more tests

* move fuzz tests. Got rid of global test_data_path

* fixes for CI failures

* add bazel files

tests/BUILD.bazel

@@ -9,20 +9,41 @@ cc_test(
     name = "flatbuffers_test",
     testonly = 1,
     srcs = [
+        "evolution_test.cpp",
+        "evolution_test.h",
         "evolution_test/evolution_v1_generated.h",
         "evolution_test/evolution_v2_generated.h",
+        "flexbuffers_test.cpp",
+        "flexbuffers_test.h",
+        "fuzz_test.cpp",
+        "fuzz_test.h",
+        "is_quiet_nan.h",
+        "json_test.cpp",
+        "json_test.h",
+        "monster_test.cpp",
+        "monster_test.h",
         "monster_test_bfbs_generated.h",
         "namespace_test/namespace_test1_generated.h",
         "namespace_test/namespace_test2_generated.h",
         "native_type_test_impl.cpp",
         "native_type_test_impl.h",
         "optional_scalars_generated.h",
+        "optional_scalars_test.cpp",
+        "optional_scalars_test.h",
+        "parser_test.cpp",
+        "parser_test.h",
+        "proto_test.cpp",
+        "proto_test.h",
+        "reflection_test.cpp",
+        "reflection_test.h",
         "test.cpp",
         "test_assert.cpp",
         "test_assert.h",
         "test_builder.cpp",
         "test_builder.h",
         "union_vector/union_vector_generated.h",
+        "util_test.cpp",
+        "util_test.h",
     ],
     copts = [
         "-DFLATBUFFERS_TRACK_VERIFIER_BUFFER_SIZE",