Add a fake data generator

[hombit]

Add an utility function for fake non-variable light curve generation

[codecov]

Codecov Report

❌ Patch coverage is 93.75000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.49%. Comparing base (f012fb6) to head (8993b0b).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/uncle_val/datasets.py	93.75%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main       #4      +/-   ##
===========================================
- Coverage   100.00%   96.49%   -3.51%     
===========================================
  Files            1        2       +1     
  Lines           25       57      +32     
===========================================
+ Hits            25       55      +30     
- Misses           0        2       +2     

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