feat: allow specifying '--insecure' flag in the configuration (database-lab#87)

Description

CLI: allow specifying '--insecure' flag in the configuration

Related issue

database-lab#87 (closed)

Checklist

• the MR description has been reviewed
• this MR contains text changes and they have been reviewed OR there are no texts changes
• this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
• this MR contains API changes and they have been reviewed OR there are no API changes