crit: add getter for pagesID field in MemoryReader struct

This commit introduces a new getter function that allows accessing
the value of the pagesID field within the MemoryReader struct.
This getter function will be beneficial for enabling checkpointctl
to extract only the required page image files efficiently.

Signed-off-by: Kouame Behouba Manasse <behouba@gmail.com>

crit/mempages.go

@@ -24,6 +24,10 @@ type MemoryReader struct {
 	pagemapEntries []*pagemap.PagemapEntry
 }
 
+func (mr *MemoryReader) GetPagesID() uint32 {
+	return mr.pagesID
+}
+
 // NewMemoryReader creates a new instance of MemoryReader with all the fields populated
 func NewMemoryReader(checkpointDir string, pid uint32, pageSize int) (*MemoryReader, error) {
 	if pageSize == 0 {