type-sitter-gen: base functionality to generate typed wrapper nodes for type-sitter

See type-sitter for more information. This library allows you to generate typed tree-sitter wrappers with even more flexibility than type-sitter-cli and type-sitter-proc. For instance, you can generate wrappers which use a custom underlying tree-sitter wrapper, or generate queries without some of their patterns and captures. You can also combine multiple generations into one file.