Initial Feature Set

[dhirtzbruch]

We need at least the following feature set:

• Write protect entity fields, to avoid them being editable by a normal user in the sonata admin GUI
• Delete protect entities, to avoid them being deletable by a normal user in the sonata admin GUI

Prerequisites:

• Delete / Write protection should be configurable via PHP 8.x Attributes
• Only specific entity instances should be protected (in our case using bool field "isProtected" from entity)