Enhance file metadata tracking and garbage collection logic

- Added AccessCount field to FileInfo struct for improved tracking of file access frequency.
- Updated NewFileInfo and NewFileInfoFromOS functions to initialize AccessCount.
- Modified DiskFS and MemoryFS to preserve and increment AccessCount during file operations.
- Enhanced garbage collection methods (LRU, LFU, FIFO, Largest, Smallest, Hybrid) to utilize AccessCount for more effective space reclamation.

vfs/fileinfo.go

@@ -7,27 +7,30 @@ import (
 )
 
 type FileInfo struct {
-	name  string
-	size  int64
-	MTime time.Time
-	ATime time.Time
+	name        string
+	size        int64
+	MTime       time.Time
+	ATime       time.Time
+	AccessCount int64 // Number of times the file has been accessed
 }
 
 func NewFileInfo(key string, size int64, modTime time.Time) *FileInfo {
 	return &FileInfo{
-		name:  key,
-		size:  size,
-		MTime: modTime,
-		ATime: time.Now(),
+		name:        key,
+		size:        size,
+		MTime:       modTime,
+		ATime:       time.Now(),
+		AccessCount: 0,
 	}
 }
 
 func NewFileInfoFromOS(f os.FileInfo, key string) *FileInfo {
 	return &FileInfo{
-		name:  key,
-		size:  f.Size(),
-		MTime: f.ModTime(),
-		ATime: time.Now(),
+		name:        key,
+		size:        f.Size(),
+		MTime:       f.ModTime(),
+		ATime:       time.Now(),
+		AccessCount: 0,
 	}
 }