bug(#4016): ensure package-info files are in jar

[maxonfjvipon]

Closes: #4016

In this PR I:

1. removed CopyMojo because we don't need it anymore since MarkMojo is gone
2. fixed PlaceMojo so it does not place jars anymore
3. fixed TranspileMojo so it appends package-info.java files for all the directories in generated sources
4. fixed UnspileMojo so it clears all the classes, including inner ones, compiled from generated sources
5. fixed UnplaceMojo so it properly unplaces all the classes copies from 6-resolve directory
6. fixed all the corresponding tests
7. fixed eo-runtime configuration in pom.xml so package-info.class files are not touched while unspiling and unplacing

As the result - now we have eo-runtime.jar without unnecessary classes and with package-info.class files for every package, so it should help with #3986

[github-actions]

🚀 Performance Analysis

Test	Base Score	PR Score	Change	% Change	Unit	Mode
benchmarks.XmirBench.xmirToEO	154.552	155.242	0.690	0.45%	ms/op	Average Time
benchmarks.XmirBench.xmirToPhi	154.608	180.254	25.646	16.59%	ms/op	Average Time
benchmarks.XmirBench.xmirToSaltyPhi	153.183	142.793	-10.390	-6.78%	ms/op	Average Time

⚠️ Performance loss: benchmarks.XmirBench.xmirToEO is slower by 0.690 ms/op (0.45%)
⚠️ Performance loss: benchmarks.XmirBench.xmirToPhi is slower by 25.646 ms/op (16.59%)
✅ Performance gain: benchmarks.XmirBench.xmirToSaltyPhi is faster by 10.390 ms/op (6.78%)

[maxonfjvipon]

@yegor256 please check

[yegor256]

a few minor comments above

[maxonfjvipon]

@yegor256 fixed, please check one more time

[0crat]

@yegor256 Hello! Thank you for your code review. Based on our team policy, you've earned +16 points for this review: +4 as a base, +16 (max) for the 1573 hits-of-code you reviewed, and -4 for the limited number of comments (5). We encourage more detailed feedback in future reviews. Your updated balance is now -512. Keep up the good work and remember that thorough reviews benefit the entire team! 👍

[0crat]

@maxonfjvipon Hey there! 👋 Great work on your contribution! You've earned +4 points, which is our base reward. We had to make some adjustments though: -8 for exceeding 200 hits-of-code (you hit 1573!), -16 for going over 800, and -4 because we only got 5 comments (we aim for at least 6). To keep you motivated, we added 28 points, bringing your total to +4. Remember, quality over quantity is key! Keep the contributions coming, but try to keep them more focused next time. Your current balance stands at +38. Looking forward to your next submission!