esprima-dotnet: Parser error on Asynchronous iteration and Asynchronous generators

The parser has issues with the aforementioned ES2018 features:

• Asynchronous iteration works only when ParserOptions.Tolerant is set to false, otherwise it results in ParserException. Sample input:

  for await (const x of syncToAsyncIterable(['a', 'b'])) {
    console.log(x);
  }
  

  results in error as expected but is parsed fine in async contexts:

   async function f() {
     for await (const x of syncToAsyncIterable(['a', 'b'])) {
       console.log(x);
     }
   }
  

• Asynchronous generators results in in ParserException regardless the ParserOptions.Tolerant setting. Sample input:

  async function* asyncGen() {
    yield someValue;
  }
  

Library version: 2.0.2