Enhance garbage collection and caching functionality

- Updated .gitignore to include all .exe files and ensure .smashignore is tracked.
- Expanded README.md with advanced configuration options for garbage collection algorithms, detailing available algorithms and use cases.
- Modified launch.json to include memory and disk garbage collection flags for better configuration.
- Refactored root.go to introduce memoryGC and diskGC flags for garbage collection algorithms.
- Implemented hash extraction and verification in steamcache.go to ensure data integrity during caching.
- Added new tests in steamcache_test.go for hash extraction and verification, ensuring correctness of caching behavior.
- Enhanced garbage collection strategies in gc.go, introducing LFU, FIFO, Largest, Smallest, and Hybrid algorithms with corresponding metrics.
- Updated caching logic to conditionally cache responses based on hash verification results.

cmd/root.go

@@ -20,6 +20,9 @@ var (
 	diskpath string
 	upstream string
 
+	memoryGC string
+	diskGC   string
+
 	logLevel  string
 	logFormat string
 )
@@ -70,6 +73,8 @@ var rootCmd = &cobra.Command{
 			disk,
 			diskpath,
 			upstream,
+			memoryGC,
+			diskGC,
 		)
 
 		logger.Logger.Info().
@@ -100,6 +105,9 @@ func init() {
 
 	rootCmd.Flags().StringVarP(&upstream, "upstream", "u", "", "The upstream server to proxy requests overrides the host header from the client but forwards the original host header to the upstream server")
 
+	rootCmd.Flags().StringVarP(&memoryGC, "memory-gc", "", "lru", "Memory cache GC algorithm: lru, lfu, fifo, largest, smallest, hybrid")
+	rootCmd.Flags().StringVarP(&diskGC, "disk-gc", "", "lru", "Disk cache GC algorithm: lru, lfu, fifo, largest, smallest, hybrid")
+
 	rootCmd.Flags().StringVarP(&logLevel, "log-level", "l", "info", "Logging level: debug, info, error")
 	rootCmd.Flags().StringVarP(&logFormat, "log-format", "f", "console", "Logging format: json, console")
 }