feat: add configurations for memory only, disk only, and memory & disk modes

vfs/gc/gc.go

@@ -20,6 +20,9 @@ type GCFS struct {
 type GCHandlerFunc func(vfs vfs.VFS, size int)
 
 func New(vfs vfs.VFS, multiplier int, gcHandlerFunc GCHandlerFunc) *GCFS {
+	if multiplier <= 0 {
+		multiplier = 1 // if the multiplier is less than or equal to 0 set it to 1 will be slow but the user can set it to a higher value if they want
+	}
 	return &GCFS{
 		VFS:          vfs,
 		multiplier:   multiplier,