feat: add error information in the progress callback

This allows users to bail parsing if an error was *definitely* detected
using the progress callback, as all possible stack versions have a
non-zero error cost.

Co-authored-by: Amaan Qureshi <amaanq12@gmail.com>

lib/include/tree_sitter/api.h

@@ -94,6 +94,7 @@ typedef struct TSInput {
 typedef struct TSParseState {
   void *payload;
   uint32_t current_byte_offset;
+  bool has_error;
 } TSParseState;
 
 typedef struct TSParseOptions {