[Accordion] You cannot change the open state of an accordion item using the `open` property

[jpzwarte]

Provide a general summary of the issue here

A user used the open property to change the open/closed state of the accordion. This did not work, since the component only checks the open property on initial render. Instead the user needed to use the toggle() method.

Extracted from #1418

🤔 Expected Behavior?

This "mistake" is probably not the last time we see this. Consider changing accordion-item to also work given the above usecase.

😯 Current Behavior

💁 Possible Solution

No response

🖥️ Steps to Reproduce

What browsers are you seeing the problem on? (only for bugs in code)

Chrome

If other, please specify.

No response

What operating system are you using?

macOS

🧢 Your product/team

SLDS

🎨 Your Theme(s)

Sanoma Learning

[Diaan]

The problem seems to be with ?open=state, this doesn't work with the removing of the attribute in the component. In angular with [open]="state" it does work