chore: relocate entire section into Section 25 Collections Frameworks

- Moved all files belonging to this section into the Section 25 folder
- Ensures consistent project structure and easier navigation
- Prepares ground for adding refined explanations and demos later

See: https://github.com/Someshdiwan/JavaEvolution-Learning-Growing-Mastering/tree/master/Section%2025%20Collections%20Frameworks
Signed-off-by: https://github.com/Someshdiwan <someshdiwan369@gmail.com>

Author: Someshdiwan