Fix: support Async iteration (fixes #9891)

[mysticatea]

What is the purpose of this pull request? (put an "X" next to item)

[X] Bug fix

Fixes #9891.

What changes did you make? (Give an overview)

This PR fixes false positive and wrongly autofix about async iteration.

• b80d41a fixed keyword-spacing rule to check the spacing between await and ( in for-await-of loops.
• 8c0e801 fixed no-await-in-loop rule to not report await expressions on for-await-of loops and to report for-await-of loops as same as await expressions.
• a64e8fe fixed object-shorthand rule to fix async generators correctly.
• 1c977b4 fixed require-await rule to handle for-await-of loops as same as await expressions.
• e30dd5f added tests to generator-star-spacing rule for async generators.
• 4a2a6a2 added tests to no-useless-computed-key rule for async generators.

Is there anything you'd like reviewers to focus on?

Are there other rules which need a fix?

I have searched by some node types in rules: ForOfStatement, AwaitExpression, Property, and MethodDefinition.

@not-an-aardvark I'm not sure about semi rule (#9891 (comment)). The semi rule addresses at the end of statements, so it doesn't look to be related to the await keyword in the middle of statements.

[not-an-aardvark]

The semi rule addresses at the end of statements, so it doesn't look to be related to the await keyword in the middle of statements.

I had that on the list because there were some problems with the semi rule and for-await statements reported in #7417. It might not be an issue now that for-await statements are part of ForOfStatement rather than ForAwaitStatement.

[mysticatea]

I got it. I have missed the issue.
I believe that semi rule is no problem since for-await-of syntax doesn't add the new node type currently.

[not-an-aardvark]

Thanks for contributing!