[TD-13408]<test>: move tests in (#10608)

* restore .gitmodules

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

This reverts commit 7db7bd9337cedc4cd0e3f3b16618b97d09791eaa.

* revert to make tests back

* immigrate file change in stand-alone repo to TDengine

* remove tests repository checkout

* add examples/rust back

* fix typo
Co-authored-by: Ntangfangzhi <fztang@taosdata.com>

.gitmodules

@@ -17,3 +17,6 @@
 [submodule "src/plugins/taosadapter"]
 	path = src/plugins/taosadapter
 	url = https://github.com/taosdata/taosadapter
+[submodule "examples/rust"]
+	path = examples/rust
+	url = https://github.com/songtianyi/tdengine-rust-bindings.git

rust @ 1c8924dc

+Subproject commit 1c8924dc668e6aa848214c2fc54e3ace3f5bf8df