* fix cmake configure warning
Signed-off-by: Nyangxuan <xuan.yang@zilliz.com>

* add config tests to ctest
Signed-off-by: Nyangxuan <xuan.yang@zilliz.com>

* rm customed add_test, using default add_test
Signed-off-by: Nyangxuan <xuan.yang@zilliz.com>

* add thirdparty/gtest and built-able
Signed-off-by: Nyangxuan <xuan.yang@zilliz.com>

* add dependences fiu
Signed-off-by: Nyangxuan <xuan.yang@zilliz.com>

* add license, rm not useful comments
Signed-off-by: Nyangxuan <xuan.yang@zilliz.com>

* fix include dir not exist bug
Signed-off-by: Nyangxuan <xuan.yang@zilliz.com>

* add some config
Signed-off-by: Nyangxuan <xuan.yang@zilliz.com>

* gtest download at configure time
Signed-off-by: Nyangxuan <xuan.yang@zilliz.com>
Co-authored-by: Nyangxuan <xuan.yang@zilliz.com>
Co-authored-by: NWang Xiangyu <xy.wang@zilliz.com>