remove old server code unused

[mpgn]

Description

This pull request removes the NXCSMBServer class and its associated functionality from the codebase, simplifying the SMB-related code. The changes include the removal of the server implementation, decorator, and imports referencing this functionality.

Removal of NXCSMBServer functionality:

• nxc/servers/smb.py: Fully removed the NXCSMBServer class, which implemented a custom SMB server, along with its imports and threading logic.

• nxc/protocols/smb.py: Deleted the requires_smb_server decorator, which previously managed the lifecycle of the NXCSMBServer instance, and removed related imports. [1] [2]

Cleanup of references to removed functionality:

• netexec.spec: Removed the reference to nxc.servers.smb from the analysis configuration, reflecting the removal of the NXCSMBServer implementation.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

[NeffIsBack]

Highly appreaciated! This is also ancient stuff. Can you also rip out on_response/on_request in the example module and the smb.py module logic?

[mpgn]

Highly appreaciated! This is also ancient stuff. Can you also rip out on_response/on_request in the example module and the smb.py module logic?

done ✅

[NeffIsBack]

LGTM