feat(discord): add createEvent action

[felifluid]

Adds the functionality of creating events on a discord server.
This also implements a new dynamic-data to list voice and stage channels dynamically.

[CLAassistant]

All committers have signed the CLA.

[barinali]

Thanks for the contribution, @felifluid! Once you help me with the open remark, I plan to do a minor iteration on your pull request and go ahead with that.

By the way, I have already tested it, and it works well. I appreciate your effort!

[barinali]

I've made some changes as below, @felifluid. I'll merge it once the pipeline succeeds. I'd appreciate it if you could test this and let me know if it's working as expected on your end.

• introduced dynamic fields where we show some fields and they're conditionally required
• renamed the action to align it more with Discord wording
• removed the ineffective privacy_level field as it's always 2
• transform argument keys to camel case for consistency

Thanks once again!

[felifluid]

I was really getting my head around how this dynamic fields work. Well, now I know! Thanks for making this so much prettier 😁
I will give it a test as soon as I get to it (:

[barinali]

@felifluid I'll create a pull request to remove the new prefix from the name and the key in action, as it's redundant and also for consistency along with other actions.

This will cause mismatching data in your local in case you have already used this action. So, please keep in mind that you'll have to update the relevant steps in your flows.