Support for top level await

## Bug Description

Top level await breaks hermes parser

```
await Promise.resolve()
```

## The Expected Behavior

Top level await is common in certain scenarios, it should be supported at the parser level

Start by reproducing the parser failure with `await Promise.resolve()` and trace the parser entry point that handles top-level statements. The issue is done when Hermes accepts this top-level await syntax without a parser error, with coverage for the example behavior.

Written by the indexing model from the issue text.