Mark steps as definite on query construction

* Add a ts_query_pattern_is_definite API, just for debugging this
* Store state_count on TSLanguage structs, to allow for scanning parse tables

lib/include/tree_sitter/api.h

@@ -21,7 +21,7 @@ extern "C" {
  * The Tree-sitter library is generally backwards-compatible with languages
  * generated using older CLI versions, but is not forwards-compatible.
  */
-#define TREE_SITTER_LANGUAGE_VERSION 11
+#define TREE_SITTER_LANGUAGE_VERSION 12
 
 /**
  * The earliest ABI version that is supported by the current version of the
@@ -718,6 +718,12 @@ const TSQueryPredicateStep *ts_query_predicates_for_pattern(
   uint32_t *length
 );
 
+bool ts_query_pattern_is_definite(
+  const TSQuery *self,
+  uint32_t pattern_index,
+  uint32_t step_index
+);
+
 /**
  * Get the name and length of one of the query's captures, or one of the
  * query's string literals. Each capture and string is associated with a

lib/include/tree_sitter/parser.h

@@ -119,6 +119,7 @@ struct TSLanguage {
   const uint16_t *small_parse_table;
   const uint32_t *small_parse_table_map;
   const TSSymbol *public_symbol_map;
+  uint32_t state_count;
 };
 
 /*