Add a search option for games using IGDB

**Is your feature request related to a problem? Please describe.**

Add a games search option to Spectra and use IGDB since their [API is free with no restrictions on data licensing](https://api.igdb.com/) compared to mobygames and the like. There are multiple ways to consume the api and there is already a [reference bot](https://gitlab.com/SirRandall/Bender) that does so.

**Describe the solution you'd like**

`s?igdb ` or `s?games ` brings up a card with info on the search term.

**Describe alternatives you've considered**

Some bots offer a Steam search option, but it doesn't include console games or games only available by physical copy or through GOG/EGS/Itch/etc.

Currently the bot hosted in their server is only available there. I don't trust myself to self host the reference bot in a secure way.

**Additional context**


Begin by reading the linked IGDB API documentation and the Bender reference bot to understand the available game-search data. Then locate Spectra's existing command and card-response entry points; done means `s?igdb ` or `s?games ` returns a game-information card.

Written by the indexing model from the issue text.