Core: Add timestamps to logging for seed generation

[kedNalatacId]

Please format your title with what portion of the project this pull request is targeting and what it's changing.

ex. "MyGame4: implement new game" or "Docs: add new guide for customizing MyGame3"

What is this fixing or adding?

Adds timestamps to logging when doing generation.

How was this tested?

Generated many seeds.

If this makes graphical changes, please attach screenshots.