Feat - Introduce `readonly` properties

[tarlepp]

[gitguardian[bot]]

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🔎 Detected hardcoded secret in your pull request

GitGuardian id	Secret	Commit	Filename
1948122	Generic High Entropy Secret	78d07b527edf36286fd026ccaf9ba3898bc492b5	phpunit.xml.dist	View secret

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[coveralls]

Coverage decreased (-0.0008%) to 99.895% when pulling 4647c5194ba99628b5c381c4237c00baf552acf7 on feat/readonly-properties-in-entity-test-case into 8dd419ed580aa1be1b40e87490e614e97c32f14b on master.