New CLI command to verify a password database against the HIBP database dump.

Motivation and context

Was inspired by https://news.ycombinator.com/item?id=16446020

How has this been tested?

Locally.

Screenshots (if appropriate):

$ keepassxc-cli pawned ~/1.kdbx ~/Downloads/pwned-passwords-2.0.txt
Insert password to unlock /home/louib/1.kdbx: 
Password for entry2 (fdd9d458b34d1157ffa3053787674971) was pawned 14434 times.
Password for entry1 (eff7485a277952b289456b3d71a3b300) was pawned 5401 times.
Password for entry3 (08a7c64479e9a54cc22f93439bd0cd7a) was pawned 5401 times.

Types of changes

• ✅ New feature (non-breaking change which adds functionality)

Checklist:

• ✅ I have read the CONTRIBUTING document. [REQUIRED]
• ✅ My code follows the code style of this project. [REQUIRED]
• ✅ All new and existing tests passed. [REQUIRED]
• ✅ I have compiled and verified my code with -DWITH_ASAN=ON. [REQUIRED]
• ✅ My change requires a change to the documentation and I have updated it accordingly.