remove capsule dependencies

[jorgeaguileraseqera]

This PR removes the capsule build system and uses the shadowJar plugin

Sadly, due the current launcher executes capsule the first time, in order to download and generate the classpath, we need to upgrade also the launcher

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[pditommaso]

Resurrecting this PR with some improvements. Main changes:

• Remove the dependency on deprecated Capsule loader
• Do not rely on Maven for Nextflow installation process
• The nextflow-*-one.jar file includes all Nextflow core modules (not plugins) and dependencies
• Use the Gradle ShadowJar plugin to create the "one" jar file
• The nextflow-*-all is replaced by the nextflow-*-dist package that's the same as the "one" package with self-executing ability.
• Enable the default Nextflow plugin install/update capability for "dist" package.

[pditommaso]

@bentsherman willing to give this a try?