Ryan/dev

[Ryan-Rhys]

Reference Issues/PRs

What does this implement/fix? Explain your changes

Implements:

1. Dice Kernel
2. Forbes Kernel
3. Faith Kernel
4. Intersection Kernel
5. Inner Product Kernel
6. Braun-Blanquet Kernel
7. Rogers-Tanimoto Kernel
8. Russell-Rao Kernel
9. Sogenfrei Kernel
10. Sokal-Sneath Kernel
11. Rand Kernel
12. Otsuka Kernel

What testing did you do to verify the changes in this PR?

Test suite for each kernel.

Pull Request Checklist

• Added a note about the modification or contribution to the ./CHANGELOG.md file (if applicable)
• Added appropriate unit test functions in the ./gauche/tests/* directories (if applicable)
• Modify documentation in the corresponding Jupyter Notebook under ./notebooks/ (if applicable)
• Ran python -m py.test tests/ and make sure that all unit tests pass (for small modifications, it might be sufficient to only run the specific test file, e.g., python -m py.test tests/kernels/test_graph_kernels.py)
• Checked for style issues by running black . and isort .