* Use com.daml as groupId for all artifacts
CHANGELOG_BEGIN
[SDK] Changed the groupId for Maven artifacts to ``com.daml``.
CHANGELOG_END
* Add 2 additional maven related checks to the release binary
1. Check that all maven upload artifacts use com.daml as the groupId
2. Check that all maven upload artifacts have a unique artifactId
* Address @cocreature's comments in https://github.com/digital-asset/daml/pull/5272#pullrequestreview-385026181
* Spin off TokenHolder into a new library
Avoids having weird dependencies between different packages, makes TokenHolder available on Maven
* Fix auth-utils path