Add Shadow Credentials module

[NeffIsBack]

Description

Adds shadow credentials module, heavily inspired by pyWhisker: https://github.com/ShutdownRepo/pywhisker
Similar to pyWhisker you can:

• list
• add
• remove
• backup
• revert
  keyCredentials of computers.

Related PRs: #936, #1234

AI disclosure: I got infected and started to use codex as well. Turns out to be quite decent when adding guard rails and properly review the output. Model that was used: gpt-5.6-sol high. Reviewed the module (and with that tested the stuff obviously).

Type of change

Insert an "x" inside the brackets for relevant items (do not delete options)

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Deprecation of feature or functionality
• This change requires a documentation update
• This requires a third party update (such as Impacket, Dploot, lsassy, etc)
• This PR was created with the assistance of AI (list what type of assistance, tool(s)/model(s) in the description)

Setup guide for the review

Execute the module, e.g.:

poetry run nxc ldap 192.168.56.11 -u eddard.stark -p FightP3aceAndHonor! -M shadow-creds -o TARGET=testcomputer$ ACTION=add
poetry run nxc ldap 192.168.56.11 -u eddard.stark -p FightP3aceAndHonor! -M shadow-creds -o TARGET=testcomputer$ ACTION=list
...

Screenshots (if appropriate):

Add/list/remove:

Get the cred info:

Backup&Revert:

Checklist:

[azoxlpf]

LGTM :

Info :