checkstyle configuration for API

[Machine-Maker]

The checkstyle configuration for the API. The server's will come later and be mostly similar with some key differences (like javadocs and excluding decompiled sources).

Has a file that includes all packages in the API that need to be done. Once removed from that list, all files in it will be subject to checkstyle.

Checkstyle Categories

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1. Annotations
2. Block Checks
3. Class Design
4. Coding
5. Headers
6. Imports
7. Javadoc Comments
8. Metrics
9. Misc
10. Modifiers
11. Naming Conventions
12. Regexp
13. Size Violations
14. Whitespace

[Machine-Maker]

Ok, this is ready to be reviewed. I'm sure there will be things we notice when we start updating all the files it tells us to that we don't want, but we can make those changes as we go along.

This also isn't validated against any formatter yet, so there could be conflicts. We will find those out though as we go.

It also isn't running the custom import order yet, because that will come with the formatter.

[Machine-Maker]

So there's a ton of new logic now in the api's build.gradle. This should probably be moved somewhere, idk if we wanna do the buildSrc thing, or make it part of pw, or what