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/monster_test.h

@@ -0,0 +1,36 @@
+#ifndef TESTS_MONSTER_TEST_H
+#define TESTS_MONSTER_TEST_H
+
+#include <string>
+
+#include "flatbuffers/detached_buffer.h"
+#include "monster_test_generated.h"
+
+namespace flatbuffers {
+namespace tests {
+
+flatbuffers::DetachedBuffer CreateFlatBufferTest(std::string &buffer);
+
+void AccessFlatBufferTest(const uint8_t *flatbuf, size_t length,
+                          bool pooled = true); 
+
+void MutateFlatBuffersTest(uint8_t *flatbuf, std::size_t length);
+
+void ObjectFlatBuffersTest(uint8_t *flatbuf);
+
+void CheckMonsterObject(MyGame::Example::MonsterT *monster2);
+
+void SizePrefixedTest();
+
+void TestMonsterExtraFloats(const std::string& tests_data_path);
+
+void EnumNamesTest();
+
+void TypeAliasesTest();
+
+void ParseAndGenerateTextTest(const std::string& tests_data_path, bool binary);
+
+}  // namespace tests
+}  // namespace flatbuffers
+
+#endif