Convert from boost test to gtest

[bnavarma-ms]

This pull request migrates the test suite from Boost.Test to Google Test (GTest) and updates the CMake configuration, test code, and includes accordingly. It also adds a VSCode configuration to improve C++ standard library header recognition. The most important changes are grouped below.

Test Framework Migration:

• Replaces all Boost.Test macros and assertions (e.g., BOOST_AUTO_TEST_CASE, BOOST_CHECK, BOOST_ASSERT) with Google Test equivalents (TEST, ASSERT_*, EXPECT_*, GTEST_FAIL) across all test files, such as Test/src/AlgoTest.cpp, Test/cuda/pq_perf.cpp, Test/cuda/cuda_tests.cpp, Test/inc/Test.h, Test/src/Base64HelperTest.cpp, and Test/src/CommonHelperTest.cpp. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22]

CMake and Dependency Updates:

• Updates Test/CMakeLists.txt to remove Boost unit test framework as a dependency, and adds logic to find or fetch Google Test using CMake's FetchContent if not already available. Updates the test executable to link against GTest. [1] [2]

Code and Naming Cleanup:

• Refactors test suite and test case structure to use Google Test's namespace and TEST conventions instead of Boost's suite macros. Renames some test functions for clarity (e.g., Test → RunTest). [1] [2] [3] [4]

Editor Configuration:

• Adds a .vscode/settings.json file to improve C++ standard library header recognition in VSCode by associating standard headers with the C++ language mode.

Header File Updates:

• Replaces Boost.Test includes with Google Test includes in test headers (e.g., Test/inc/Test.h).

These changes collectively modernize the project's test infrastructure, making it easier to maintain and integrate with modern C++ development environments.

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