feat: improvements of invoice system

[Z3rio]

Description

Changes:

• Secured unsecured invoice events
• Added reason column to invoices to specify the reasoning behind the invoice
• Added candecline column to invoices to specify whether the invoice can be declined or not
• Added an event that gets triggered upon an invoice being paid, or declined
• Fixed syncing of invoices, they are now fetched upon opening the bank app, instead of fetching them one singular time when opening the phone for the first time.

Checklist

• I have personally loaded this code into an updated qbcore project and checked all of its functionality.
• My code fits the style guidelines.
• My PR fits the contribution guidelines.

[github-actions]

This PR has had 60 days of inactivity & will close within 7 days

[Z3rio]

This PR has had 60 days of inactivity & will close within 7 days

Yeah, no. QBCore is the ones that are "inactive", not me lmfao. Thanks

Genuinely no point in this bot, doing way more damage than good.

[Z3rio]

Would be great to have this looked at, would love to be able to clean-up some of my old qb repos.
@GhzGarage