eca_content: Add an action for creating a new content entity

Issue information

From user: mxh

Related to !35 (merged)

Contribution record

Fork management

Problem/Motivation

As we currently already support generic actions to set field values on an entity, one missing part in scope of CRUD functionality is being able to create a new content entity.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

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