feat(#779): Add j$ Prefix For Packages

[volodya-lombrozo]

In this PR I added j$ prefix for package names.
Moreover, I slightly modified the prefix adding strategy: we used to add the prefix only to the last element in the name, now we add the prefix for all the elements.

Was: org/eolang/j$EoParser
Become: j$org/j$eolang/j$EoParser

Related to #779.

---

PR-Codex overview

This PR focuses on enhancing the handling of prefixed names in the Eolang representation, particularly in encoding and decoding processes, and updating relevant tests to reflect these changes.

Detailed summary

• Updated retrievesName method to change expected name format.
• Modified BachedTranslator application to improve readability.
• Adjusted encodesName method to use PrefixedName for encoding.
• Enhanced HasClass to encode package names using PrefixedName.
• Updated DirectivesMetas to utilize prefixed package names.
• Added new methods in PrefixedName for encoding and decoding.
• Improved handling of prefixed strings in decode and added a cut method.

✨ Ask PR-Codex anything about this PR by commenting with /codex {your question}

[volodya-lombrozo]

@yegor256 Could you have a look, please? These changes should solve the problem with package names.

[yegor256]

@volodya-lombrozo LGTM

[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 9min).