Add category properties to all templates

Issue information

From user: jurgenhaas

Contribution record

Fork management

Problem/Motivation

bpmn.io is going to provide a grouping feature for the template selector, see https://github.com/bpmn-io/element-template-chooser/issues/5#issuecomment-1079752288

For this, we need to provide a category property containing id and label for each template. This should be filled with the provider name and id, i.e. the module that provides the template.

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