[ALL-ATTACHMENTS] Enhancement: same name files with added suffix in the zip

[Arsnael]

When we have multiple files with the same name in an email, instead of discarding all except the latest one, we could try to add them all with a suffix on the name? Like adding _1, _2, ...

For example if you have 3 files named check.sh, you would ended with in the zip:

• check.sh
• check_1.sh
• check_2.sh

Do a POC first for this edge case.