* merge with develop branch.

change query/tests/CMakeLists.txt to allow unused function and variable.

* refactor data generating.

* refactor.

* refactor.

* refactor.

* refactor.

* refactor

* add prepare stmt function.

* refactor get rand timestamp.

* fix windows compile error.

* copy logic of generate data for stmt.

* insert data basically works now.

* fix windows compile issue.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>