Publish Gradle plugin to the Plugin Portal

[rachelcarmena]

The configuration to publish Arrow Meta artifacts (snapshots and releases) in Bintray is being added in #40.

However, Gradle Plugin is not included in #40 because it has its own way to be published to the Plugin Portal and also its own version roadmap:

https://plugins.gradle.org/docs/publish-plugin

The desired name for the Gradle plugin would be:

io.arrow-kt.arrow

[rachelcarmena]

Publishing plugin io.arrow-kt.arrow version 0.10.2
Thank you. Your new plugin io.arrow-kt.arrow has been submitted for approval
by Gradle engineers. 
The request should be processed within the next 24 hours, at which point
you will be contacted via email.
Publishing artifact build/libs/gradle-plugin-0.10.2.jar
Publishing artifact build/publish-generated-resources/pom.xml
Activating plugin io.arrow-kt.arrow version 0.10.2

cc: @raulraja

[rachelcarmena]

The plugin has been published:

• https://plugins.gradle.org/plugin/io.arrow-kt.arrow

and the artifact of the plugin is available successfully:

However, we're going to change the groupId arrow.meta.plugin.gradle by io.arrow-kt

[rachelcarmena]

When fixing the groupId, it's considered as a new plugin so we must wait up to 24 hours for the new publication.

[rachelcarmena]

The plugin is published again: https://plugins.gradle.org/plugin/io.arrow-kt.arrow

However, I'm solving a problem with a hardcoded version in ArrowKotlinGradleSubplugin which raises this error when using the plugin:

Could not find io.arrow-kt:gradle-plugin:0.0.1.

[rachelcarmena]

I'm going to close this issue because Gradle plugin is published, new versions will be published without required approval from Gradle team and the problems found when using the published plugin have been solved in #69.