build!: fix dependencies

[joshuasing]

Summary
Fix Gradle dependency problem (@joshuasing PEBKAC) introduced in 21ec9eb
compileOnlyApi results in the Maven scope compile which causes the dependency to be included by the Maven shade plugin.

Use compileOnly for platform dependencies (e.g. Bukkit, BungeeCord).
Use api for dependencies that should be transitvely exported to consumers (e.g. chameleon-api, adventure).

More information: https://docs.gradle.org/current/userguide/java_library_plugin.html

Changes

• Use api for Chameleon dependencies.
• Use compileOnly for platform dependencies.

Checklist

• I acknowledge and agree to the terms of the Developer Certificate of Origin.
• All contributed code can be distributed under the terms of the MIT License.
• I have read the contributing guidelines and code of conduct.
• I have checked the "Allow edit from maintainers" option.
• I have added appropriate unit tests for my changes.

This pull request contains breaking build changes.