Reads a list of use declarations
```ebnf
use_declarations ::= use_declaration (',' use_declaration)*
```
@see https://github.com/php/php-src/blob/master/Zend/zend_language_parser.y#L380
@return {UseItem[]}
function(typed) {
    const result = [this.read_use_declaration(typed)];
    while (this.token === ",") {
      this.next();
      if (typed) {
        if (
          this.token !== this.tok.T_FUNCTION &&
          this.token !== this.tok.T_CONST &&
          this.token !== this.tok.T_STRING
        ) {
          break;
        }
      } else if (
        this.token !== this.tok.T_STRING &&
        this.token !== this.tok.T_NS_SEPARATOR
      ) {
        break;
      }
      result.push(this.read_use_declaration(typed));
    }
    return result;
  }