[BUG] - SfAccordion is not showing active list on SSR

[dawid-ziobro]

Describe the bug
SfAccordion by default has all children hidden. With a prop open passed, selected child list is opening, but this is done on mounting, which is done on client side.
This leads to increasing CLS due to moving next element down after opening selected child list.
This can also have inpact on SEO, as links for child elements are not present in response from the server.

How to reproduce
Steps to reproduce the behavior:

1. Go to https://demo-ct.vuestorefront.io/c/men
2. Refresh page.
3. Accordion is closed on init.

Expected behavior
On page load, list should be already opened.

Actual behavior
On page load, list list closed and is opening after a while.

Screenshots
On page load:

After a while list is opening:

Proposed solution
SfAccordionItem should accept a new prop like openOnInit that works similarly and in pair with open prop. It could indicate the component if it should be opened on closed on init (SSR).

┆Issue is synchronized with this Jira Zadanie by Unito