type-sitter-proc: generate type-sitter wrappers via procedural macros

See type-sitter for background information. This exports procedural macros which generate typed nodes. Typed nodes can also be generated from a built-script using type-sitter-gen, or from a command-line interface using type-sitter-cli.

Instead of depending on this, typically you should depend on type-sitter instead with the proc feature (enabled by default). type-sitter with the proc feature re-exports this crate, but also type-sitter-lib, which the generated code depends on at runtime.