Configuration: remove stdlib as transitive dependency

[rachelcarmena]

Current status

stdlib appears as transitive dependency in all the Arrow libraries.

From POM files:

    <dependency>
      <groupId>org.jetbrains.kotlin</groupId>
      <artifactId>kotlin-stdlib-jdk8</artifactId>
      <version>1.4.31</version>
      <scope>compile</scope>
    </dependency>

Proposal

Remove the default stdlib added by Kotlin plugin to be able to add it with compileOnly configuration and to keep it internal.