Bug 37181: Add --confirm option to pseudonymize_statistics.pl

Bug 37181: Add --confirm option to pseudonymize_statistics.pl

To test:
1 - Perform some transactions
2 - Enable Pseudonymization
3 - perl misc/maintenance/pseudonymize_statistics.pl -v
4 - Confirm test run an nothing changed
5 - perl misc/maintenance/pseudonymize_statistics.pl -v -c
6 - Confirm statistics are pseudonymized

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Amend: tidied the changes [tcohen]
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>