feat(#65): Decompilation of simple constructs

[volodya-lombrozo]

In this PR I tried to decompile simple EO constructs related to 'benchmark' example.

Here we decompile high-level code generated by opeo-maven-plugin and transform it to low-level code acceptable by jeo-maven-plugin.

Closes: #65

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PR-Codex overview

This PR focuses on adding the opcodes() method to various classes in the codebase.

Detailed summary

• Added the opcodes() method to the AstNode interface.
• Implemented the opcodes() method in multiple classes, throwing an UnsupportedOperationException for now.
• Added the opcodes() method to the Literal class, returning a list of opcodes based on the object type.
• Added the disableCounting() method to the Opcode class to disable opcodes counting for tests.
• Added the opcodes() method to the Opcode class, returning a list containing the opcode itself.

The following files were skipped due to too many changes: src/main/java/org/eolang/opeo/ast/Literal.java, src/main/java/org/eolang/opeo/ast/Label.java, src/test/resources/xmir/Bar.xmir, src/main/java/org/eolang/opeo/ast/OpcodeName.java, src/main/java/org/eolang/opeo/compilation/OpeoNodes.java, src/test/java/org/eolang/opeo/compilation/OpeoNodesTest.java

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[volodya-lombrozo]

@rultor merge

[rultor]

@rultor merge

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

[rultor]

@rultor merge

@volodya-lombrozo Done! FYI, the full log is here (took me 3min)