chore: generate automatic module names

[toddbaert]

See title.

Tested this locally with mvn install, then opened the locally cached module. This is what the MANIFEST.MF looks like for the flagd provider:

Manifest-Version: 1.0
Automatic-Module-Name: dev.openfeature.contrib.providers.flagd
Build-Jdk-Spec: 1.8
Created-By: Maven JAR Plugin 3.3.0

Note: I had to "make up" some module names for a few providers that would otherwise have invalid ones based on the module name (apparently "-" is illegal).

⚠️ Note: http://branchandbound.net/blog/java/2017/12/automatic-module-name/ and https://blog.joda.org/2017/04/java-se-9-jpms-module-naming.html strongly recommend that module names should match the root package of the jar. I've therefore used the root package for the "-" cases.

Fixes: #261