Separate header file dependencies for test and src.

[ColinLeeo]

In this pr:

1. The test code now fully relies on the installed header files from the source code rather than the source code itself, separating the outputs of the source code and test code.
2. Removed unused code.
3. Saved the gtest code locally, eliminating the need for remote fetching.

[ColinLeeo]

Well.. This PR introduces changes that may encounter issues in the Windows environment. Using the shared library form causes exceptions during test linking, and despite numerous attempts, the problem remains unresolved. To fix them, currently, the tests are linked to TsFile using the static linking approach. Additionally, on Windows devices, std::random_device rd; does not return random values. As a result, I have modified some test methods for obtaining random seeds.