[ES|QL] Update grammars (elastic#222142)

This PR updates the ES|QL grammars (lexer and parser) to match the
latest version in Elasticsearch.

---------

Co-authored-by: Stratoula Kalafateli <efstratia.kalafateli@elastic.co>

Author: kibanamachine

src/platform/packages/shared/kbn-esql-ast/src/antlr/esql_parser.g4

@@ -189,7 +189,7 @@ identifierOrParameter
     ;
 
 limitCommand
-    : LIMIT INTEGER_LITERAL
+    : LIMIT constant
     ;
 
 sortCommand
@@ -306,7 +306,7 @@ rrfCommand
    ;
 
 rerankCommand
-    : DEV_RERANK queryText=constant ON rerankFields WITH inferenceId=identifierOrParameter
+    : DEV_RERANK queryText=constant ON rerankFields (WITH inferenceId=identifierOrParameter)?
     ;
 
 completionCommand