New `GenerateMode`

[sepandhaghighi]

Reference Issues/PRs

What does this implement/fix? Explain your changes.

• 8 new generation modes added
  1. F1_VS_X1
  2. F2_VS_X1
  3. F1_VS_X2
  4. F2_VS_X2
  5. X1_VS_F1
  6. X1_VS_F2
  7. X2_VS_F1
  8. X2_VS_F2
• CHANGELOG.md updated

Any other comments?

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 96.87500% with 1 line in your changes missing coverage. Please review.

Project coverage is 99.44%. Comparing base (3c0144d) to head (4310d50). Report is 1 commits behind head on dev.

Files	Patch %	Lines
samila/genimage.py	95.84%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #223 +/- ## ========================================== + Coverage 99.41% 99.44% +0.03% ========================================== Files 4 4 Lines 677 709 +32 Branches 103 111 +8 ========================================== + Hits 673 705 +32 Misses 2 2 Partials 2 2 ```

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