Flatter implemented

[EugeneDar]

PR-Codex overview

This PR focuses on adding copy and reframe methods to the Entity class and implementing them in the Empty, Data, Lambda, FlatObject, and NestedObject classes.

Detailed summary

• Added copy() and reframe() methods to the Entity class.
• Implemented copy() and reframe() methods in the Empty, Data, Lambda, FlatObject, and NestedObject classes.
• Added getters for data, function, path, name, and locator in the Data, Lambda, Locator, FlatObject, and NestedObject classes.
• Updated toString() method in the Lambda and FlatObject classes to use the getter methods.
• Added Flatter class for flattening objects in the ObjectsBox.
• Implemented flat(), flatOne(), removeUnusedObjects(), resuspendLocalBinds(), and renameObjects() methods in the Flatter class.

The following files were skipped due to too many changes: src/main/java/org/objectionary/Flatter.java

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[EugeneDar]

@yegor256 @Graur
Since I am discontinuing work on this project, I am passing this PR on to you as the final representation of the final transformation. Please take care of it.

You may have questions about implementing the functionality of this repository as well as writing integration tests. For that reason, I am attaching this link, which is ALL the code written (it just hasn't been refactored):
https:/EugeneDar/flatty/tree/finished