add melonly integration

[finaIcutpro]

Description

This PR adds Melonly's verification module to TicketsBot integration.

Type of Change

• Bug fix
• New feature
• Breaking change

Testing

I ran node --check and tested the worker on my own Cloudflare account.

Checklist

• My code follows the style of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works

[finaIcutpro]

Note: This feature requires a specific global API token. TicketsBot team, please reach out to me @ finalcutpro on Discord to get this token

[biast12]

I was just about to say, would you mind joining our support server and opening a general ticket?
https://discord.com/invite/ticketsbot

[biast12]

Generally speaking, this looks good, it does have 1 issue though:
Per the Integration Standards §5, should a validate endpoint only be used if the integration uses per-guild secrets.
Melonly doesn't have any, so the endpoint and function are not needed and should be removed.

[finaIcutpro]

Thank you for your suggestions. I've made changes to resolve both of your requests.