Phase 1: Implement database operations and initial CLI interface

[prog-supdex]

This PR introduces core database operations for managing licenses, nodes, and audit logs within the system.
It also implements the initial structure for the CLI interface, providing support for the following commands:

• add: Adds a license to the local relay server's pool.
• rem: Removes a license from the pool. (in progress)
• ls: Lists all licenses currently in the pool. (in progress)
• stat: Displays statistics for a specific license. (in progress)

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}