Enhancement(Forums): Showcase-type posts receive embed for awesome-* repo

[JacobCoffee]

Summary

Some other servers have popular repos that then have an awesome-$REPO repo for related uses. Add an embed to open a PR to add their showcase thing to that repo.

Basic Example

For example: https://github.com/litestar-org/awesome-litestar/

• User posts new forum post in #showcase
• @byte-bot-app replies with an embed to the guilds' assigned awesome-$repo inviting the user to open a PR to update the repo with this new showcase thing.

Think: User posts XYZ built with $MyLib -> Embed -> Open PR -> We see this in the repo:

### Built with `$MyLib`

- [thing1](https://zombo.com)
- [New thing from user above](https://zombo.com)

Drawbacks and Impact

This raises another issue on unique commands like this that probably wouldn't be useful en masse for support custom commands per-guild. However, with per-guild configs foundation laid in #9, we can support this.

Unresolved questions

Would require a showcase (or similarly named) forum channel to exist. We can bootstrap that if not, or guild can configure/supply existing channel ID

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