Fix(meterpreter): Prevent truncation of remote file when using 'edit'…

[0xGrooted]

Hey there,
My code replaces the deprecated, manual file handling logic within cmd_edit with the robust, high-level client.fs.file.edit(path) utility.

The manual logic was flawed because the remote file was removed immediately when the handler attempted to open it to read its contents, causing complete data loss if the local editor crashed or the session was interrupted before re-upload.

The fix ensures the edit command now follows the atomic procedure:

• Safely downloads the remote file to a local temporary file.
• Launches the local editor ($EDITOR).
• Uploads the file back to the remote host (overwriting the original) only upon successful exit from the editor.

This (hopefully) Fixes #20574.

[0xGrooted]

please see comment this should be completed now! Let me know if it needs any more changes.