feat(logging): add log clear API

[NewYaroslav]

Summary

• add backend-neutral LogClearOptions/LogClearResult and ILogger::clear_logs default unsupported implementation
• add Logger::clear_logger and Logger::clear_all_loggers using strategy snapshots outside the global logger lock
• add LOGIT_CLEAR_LOGGER/LOGIT_CLEAR_LOGGER_EX/LOGIT_CLEAR_ALL_LOGGERS/LOGIT_CLEAR_ALL_LOGGERS_EX macros
• implement cleanup for MemoryLogger, MdbxLogger, FileLogger, and UniqueFileLogger
• add clear API tests for memory, file, unique-file, unsupported backends, snapshot behavior, and MDBX session/payload semantics

Verification

• cmake -S . -B build-clear -G "MinGW Makefiles" -DLOGIT_CPP_BUILD_TESTS=ON
• cmake --build build-clear --target logger_clear_api_test -j2
• ctest --test-dir build-clear -R logger_clear_api_test --output-on-failure
• cmake -S . -B build-clear-mdbx -G "MinGW Makefiles" -DLOGIT_CPP_BUILD_TESTS=ON -DLOGIT_WITH_MDBX=ON -DLOGIT_USE_SUBMODULES=ON
• cmake --build build-clear-mdbx --target mdbx_logger_test -j2
• ctest --test-dir build-clear-mdbx -R mdbx_logger_test --output-on-failure
• cmake -S . -B build-clear-cxx11 -G "MinGW Makefiles" -DLOGIT_CPP_BUILD_TESTS=ON -DCMAKE_CXX_STANDARD=11
• cmake --build build-clear-cxx11 --target memory_logger_backend_test logger_clear_api_test -j2
• git diff --check -- include/logit_cpp/logit/loggers/ILogger.hpp include/logit_cpp/logit/Logger.hpp include/logit_cpp/logit/log_macros.hpp include/logit_cpp/logit/loggers/MemoryLogger.hpp include/logit_cpp/logit/loggers/MdbxLogger.hpp include/logit_cpp/logit/loggers/FileLogger.hpp include/logit_cpp/logit/loggers/UniqueFileLogger.hpp tests/CMakeLists.txt tests/logger_clear_api_test.cpp tests/mdbx_logger_test.cpp

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