Add synthetic SNPs generation feature

[apriha]

Fixes #194

[codecov]

Codecov Report

❌ Patch coverage is 93.05019% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.60%. Comparing base (76e27a0) to head (779bb10).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/snps/io/generator.py	96.44%	5 Missing and 3 partials ⚠️
src/snps/io/reader.py	38.46%	4 Missing and 4 partials ⚠️
src/snps/resources.py	75.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #197      +/-   ##
==========================================
+ Coverage   93.57%   93.60%   +0.03%     
==========================================
  Files           9       11       +2     
  Lines        1852     2065     +213     
  Branches      329      331       +2     
==========================================
+ Hits         1733     1933     +200     
- Misses         66       75       +9     
- Partials       53       57       +4     

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