Tests extraction

[gshigin]

Tests were moved away from test directories and placed near respective header files.

Some tests were lest in test directories due to the fact, that they require rework to be addressed to specific header files. So they left in place for later pr, this pr being only file moving and no behaviour changed

Whats left:

• bare_bones/tests/container_tests.cpp - shared typed fixture for stream_v_byte.h and vector.h.
• bare_bones/tests/coredump_test_separate.cpp - separate crash-process test for exception.h and vector bounds failures. Can be removed as core-dumping will be removed.
• series_data/tests/serialization/serializer_deserializer_tests.cpp - serialization round-trip across data storage, encoding, deserialization, and serialized data. More like integration test to be placed closer to entrypoint.
• series_data/tests/unloading/loader_unloader_tests.cpp - end-to-end unload/load state transition. Same.
• series_index/tests/trie/cedarpp_trie_tests.cpp - covers both cedarpp_tree.h and its regexp-searcher integration.
• series_index/tests/trie/regexp_searcher_test_cases.h - header with test data. Can be inlined into test file.

[vporoshok]

Please, resolve conflict