Implement Accessibility tree

[Accessibility tree](https://developer.mozilla.org/en-US/docs/Glossary/Accessibility_tree) 

Create an accessibility tree based on the DOM tree, which is used by platform-specific Accessibility APIs to provide a representation that can be understood by assistive technologies, such as screen readers.

* [MDN Accessibility tree Glossary](https://developer.mozilla.org/en-US/docs/Glossary/Accessibility_tree)
* [Accessible Name and Description Computation spec](https://w3c.github.io/accname/)
* [CDP Accessibility.getFullAXTree](https://chromedevtools.github.io/devtools-protocol/tot/Accessibility/#method-getFullAXTree)

blocks #1217 

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Implement Accessibility tree #1220

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