Addon-links: Update linkTo type to accept function

[SiAdcock]

What I did

Updates the linkTo() type to accept a function as the second parameter. This is inline with the documentation and DefinitelyTyped.

How to test

• Is this testable with Jest or Chromatic screenshots? No
• Does this need a new example in the kitchen sink apps? No
• Does this need an update to the documentation? No

If your answer is yes to any of these, please make sure to include it in your PR.

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[shilman]

@kroeder @gaetanmaisse @emilio-martinez can you review this?

[ndelangen]

I did some testing and found the addon-link not working correctly.

After some experimentation I found that the kind + storyname sometimes broke. especially if kind is not provided.

I changed the code so the addon resolves the correct StoryItem from the storystore and gets it's name & kind.

If it cannot find a StoryItem, it logs an error and does not navigate,

FIX the broken addon links.

Functionality to support navigation by (storyId || kind || kind + storyName || storyName) is now implemented in the linkTo
itself.

It uses the global scope storyStore & clientApi, which isn't good, but we will refactor that later.

The navigate function now refuses to navigate to a story that does not exist.

hrefTo function also no longer throws an error when kind isn't provided

Add test to assert this functionality actually works

[shilman]

LGTM