Implement tests

[GeorgiiFirsov]

Actually I feel a lack of tests. It may help to optimize and refactor current code without any fear to break something.

Well, I think, it is impossible to use GitHub actions for that, because it should be implemented as a simple driver, but anyway it will be useful

[DymOK93]

I totally agree :)

[DymOK93]

Tests implemented for the basic_runtime:

• [x] heap
• [x] floating point
• [x] dynamic initialization
• [x] irql
• [x] placement new
• [x] preload_initializer
• [x] exception handling mechanism

[DymOK93]

Tests implemented for the cpp_runtime:

• [ ] algorithms
• [ ] allocators
• [ ] ktl::array
• [ ] atomics
• [ ] ktl::char_traits
• [ ] ktl::compressed_pair
• [ ] ktl::conditional_variable (expected to be fully rewritten in the near future)
• [ ] ktl::coroutine_handle
• [ ] hashes
• [ ] initializer_list (will be removed soon)
• [ ] iterators
• [ ] ktl::exception hierarchy
• [ ] RAII wrappers for mutexes and other synchronization primitives
• [ ] new and delete
• [ ] ktl::optional (requires a review)
• [ ] ktl::ratio
• [ ] smart pointers
• [ ] ktl::basic_winnt_string
• [ ] ktl::basic_winnt_string_view
• [ ] threads
• [ ] ktl::tuple
• [ ] unordered (hash-based) map and set
• [ ] functions from utility
• [ ] ktl::vector