* restore .gitmodules for master

* Revert "[TD-13408]<test>: move tests out"

This reverts commit 16a385a8336e66c4d247ac0bc6aa07e7e1e39dc8.

* immigrate file change from stand-alone repo to TDengine

for master

* remove tests repository checkout

* remove examples in CMakeLists.txt
Co-authored-by: Ntangfangzhi <fztang@taosdata.com>