#6087 Support for password protected pdfs

[ioanatflowcrypt]

This PR implemented feature to support password protected pdfs

close #6087 // if this PR closes an issue

---

Tests (delete all except exactly one):

• Tests added or updated

---

To be filled by reviewers

I have reviewed that this PR... (tick whichever items you personally focused on during this review):

• addresses the issue it closes (if any)
• code is readable and understandable
• is accompanied with tests, or tests are not needed
• is free of vulnerabilities
• is documented clearly and usefully, or doesn't need documentation

[sosnovsky]

works great 👍