types: Fix channel create overloads

[Jiralite]

Please describe the changes this PR makes and why it should be merged:
There were issues with creating channels in TypeScript:

1. <GuildChannelManager>.create() always required two arguments
2. Hovering over <GuildChannelManager>.create() would always yield a deprecation notice, despite being none
3. <GuildChannelManager>.create("name", {}) would not be a TextChannel
4. Only "GuildStore" and not the enumerable as well were being checked for in the deprecation notice

This pull request fixes those issues.

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating

[iCrawl]

Is this still needed with the enum changes merged?

[Jiralite]

Yes @iCrawl, all points but the last still stand.