2280 universe find and dataize

[levBagryansky]

Closes: #2384, #2280

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PR-Codex overview

This PR focuses on implementing the "find" and "dataize" methods in the Universe class.

Detailed summary

• Changed the access modifier of the DummyWithAtFree class to private.
• Implemented the "find" method in the Universe class to find an object by its location.
• Implemented the "dataize" method in the Universe class to dataize an object by its vertex.
• Added a new private field "indexed" in the Universe class to store already found objects.
• Added a new private method "replace" in the Universe class to replace specific EO symbols with Java symbols.
• Added tests for the "find" and "dataize" methods in the UniverseTest class.

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[levBagryansky]

@Graur could you please review these changes?

[Graur]

@levBagryansky Good one!

[Graur]

@levBagryansky Good one
@yegor256 Please take a look

[levBagryansky]

@yegor256 please check

[levBagryansky]

@yegor256 please take a look

[yegor256]

@rultor merge

[rultor]

@rultor merge

@yegor256 OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor merge

@yegor256 Done! FYI, the full log is here (took me 12min)