[EuiTreeView] Add ability to use href

[snide]

Currently the tree view only allows onClicks through a callback. The component lends itself to being a decent sidenav as well. We should add the ability to add href links to tree elements.

#2409

[myasonik]

If EuiTreeView starts to except links, what's the line between it and EuiSideNav?

What I'm really concerned about it semantics (surprise!), what's a <nav> and what isn't? What's a role=tree and what's just a list, or a list of lists?

None of these things are insurmountable, just things to stay cognizant of when extending EuiTreeView.

[mridulgogia]

Can I work on it?

[myasonik]

We don't have a plan in place for how we want this component to look in the future and how it will differentiate itself from EuiSideNav so figuring that out is the first step.

If you have any proposals, we can discus them here before digging into the code.

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[github-actions]

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