fix(Validium): Improved changes for the zk tool

[ilitteri]

What ❔

Create a new constants file exclusively for configuration files, replacing the old one. Move the implementation of writing configuration files from init.ts to config.ts.

Why ❔

Validium introduces some changes to zk tool (init.ts mainly, but not related to it) that do not follow common patterns.

The new behavior is undocumented and does not follow the hierarchical structure of the module.

Checklist

• [x] PR title corresponds to the body of PR (we generate changelog entries from PRs).
• [ ] Tests for the changes have been added / updated.
• [ ] Documentation comments have been added / updated.
• [ ] Code has been formatted via zk fmt and zk lint.
• [ ] Spellcheck has been run via zk spellcheck.
• [ ] Linkcheck has been run via zk linkcheck.