Python tree sitter: Compound Conditionals

[titomeister]

Analyzing the feature parity of tree-sitter to CAST against PyAST2CAST revealed that support for Compound Conditional generation was missing. This issue is to track the missing feature, and to make sure it gets done, as part of the effort to port PyAST2CAST to tree-sitter generation.

### Tasks
- [ ] Implement compound conditional for Python in tree-sitter
- [ ] https://github.com/ml4ai/skema/issues/877

[titomeister]

Update 4/2/2024

• The work for generating CAST for the idioms is coming along well, it need some more work but it's getting close.
• The unit tests have been written, but need some refining to make sure they sync up with the generation once that's done.