Minor adjustments to crash_gen tool, so that it can work with 3.0 code base, now can do simple -t 4 -s 25

* restore .gitmodules

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

This reverts commit f80a4ca49ff37431bc0bc0dafb5ccf5858b00beb.

* revert f80a4ca49ff37431bc0bc0dafb5ccf5858b00beb

* immigrate file change from stand-alone repo to TDengine

for 3.0

* remove tests repository for Jenkinsfile2
Co-authored-by: Ntangfangzhi <fztang@taosdata.com>

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

for 3.0 branch

* add Jenkinsfile2
Co-authored-by: Ntangfangzhi <fztang@taosdata.com>

Refactored crash_gen to have the TdeSubProcess own the SvcMgrThread object, also switched to Pylance

Enhanced crash_gen tool to run multiple instances concurrently, by using dynamic names for tables and databases

Multi-instance code working for single instance case, ready to refactor crash_gen tool into multiple files