Set up publishing to Maven Central

[Goooler]

This is required after #479.

Ref stuffs from

• https://github.com/vanniktech/gradle-maven-publish-plugin
• https://github.com/GradleUp/shadow/blob/01dd8149fc3cf592a1ed5fc1d049571dc7a5abde/gradle.properties#L17-L42
• Migrate credentials for publishing to Maven Central GradleUp/shadow#1414

[egorikftp]

@Goooler For Gradle plugin, I think we should publish a CLI tool on Maven. No reason for now to publish other modules. Any objections or ideas? 🙂

[Goooler]

Sounds reasonable! Make the Gradle plugin depend on the CLI project and publish the minified CLI.