feat(examples): add compression and system logging demos

Author: NewYaroslav

examples/example_logit_compression.cpp

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+/// \file example_logit_compression.cpp
+/// \brief Demonstrates file log compression using gzip.
+
+#include <LogIt.hpp>
+
+int main() {
+    logit::FileLogger::Config cfg;
+    cfg.directory = "gzip_logs";
+    cfg.compress = logit::CompressType::GZIP;
+    cfg.max_file_size_bytes = 64; // rotate quickly for the demo
+    cfg.max_rotated_files = 2;
+
+    LOGIT_ADD_LOGGER(logit::FileLogger, (cfg), logit::SimpleLogFormatter, (LOGIT_CONSOLE_PATTERN));
+
+    for (int i = 0; i < 20; ++i) {
+        LOGIT_INFO("compressed log", i);
+    }
+
+    LOGIT_WAIT();
+    LOGIT_SHUTDOWN();
+    return 0;
+}

examples/example_logit_queue_limit.cpp

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+/// \file example_logit_queue_limit.cpp
+/// \brief Shows how to limit the log queue size.
+
+#include <LogIt.hpp>
+
+int main() {
+    LOGIT_ADD_CONSOLE_DEFAULT();
+    LOGIT_SET_MAX_QUEUE(2);
+    LOGIT_SET_QUEUE_POLICY(LOGIT_QUEUE_DROP);
+
+    for (int i = 0; i < 10; ++i) {
+        LOGIT_INFO("queue message", i);
+    }
+
+    LOGIT_WAIT();
+    LOGIT_SHUTDOWN();
+    return 0;
+}

examples/example_logit_system_logger.cpp

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+/// \file example_logit_system_logger.cpp
+/// \brief Demonstrates usage of the cross-platform SystemLogger.
+
+#include <LogIt.hpp>
+
+int main() {
+    LOGIT_ADD_LOGGER(logit::SystemLogger, (), logit::SimpleLogFormatter, (LOGIT_CONSOLE_PATTERN));
+    LOGIT_INFO("system log entry");
+    LOGIT_WAIT();
+    LOGIT_SHUTDOWN();
+    return 0;
+}