eca_content: Add access conditions

Issue information

From user: mxh

Related to !110 (merged)

Contribution record

Fork management

Problem/Motivation

We need a condition that validates whether the current user has access to an entity with a certain operation (create, view, update, delete).
Another condition we need is for validating whether the current user has access to a certain entity field (view, edit, delete).

Steps to reproduce

Proposed resolution

Create two new condition plugins "Entity: is accessible" and "Entity: field is accessible".

Remaining tasks

Implement and cover with tests.

User interface changes

API changes

Data model changes

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