SideNav: link target API

[rolfsmeds]

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Description

API for configuring a link in SideNav to open in a new browser window/tab.

Acceptance criteria

• [ ] API for setting/getting the target attribute for the link in a SideNavItem (Flow: setTarget(String), getTarget(); target property for WC & React);
• [ ] Convenience API in Flow SideNavItem for opening the link in a new, unnamed browser tab: setOpenInNewBrowserTab(boolean) and corresponding getter (equivalent to setTarget("_blank")

Notes

• Setting rel="noopener" is unnecessary as that is the default for target="_blank" in modern browsers.
• Setting rel="noreferer" to be covered by a separate issue.

Original feature request issue: https://github.com/vaadin/flow-components/issues/5091

General criteria

• [ ] UX/DX tests in Alpha

• [ ] Documentation: New Opening in new browser tab section in SideNav docs page (add link here when done)

• [ ] How to test?

• [ ] Limitations:

Security

• [x] Security implications have been taken into account (elaborate or link to product security requirement specification if there are implications)