🎨 Add basic router and wp link directive

[luisherranz]

This PR is branched on top of #82.

This PR adds the remaining functionality: router + wp-link directive.

It's pretty much a copy/paste of the Query Loop block and Product Query block experiments.

[SantosGuillamot]

Not sure if I'm doing something wrong but it seems this PR breaks the WP Admin. I have trouble navigating between pages and at some point, I am logged out automatically. I guess we will need to add something to prevent this from happening in the WP Admin?

EDIT: Oh, it is this code to test it out and it should be fixed once we add the wp-link attribute in PHP in #81?

[DAreRodz]

I haven't tested it, but the code looks great. 💯

[SantosGuillamot]

EDIT: Oh, it is this code to test it out and it should be fixed once we add the wp-link attribute in PHP in #81?

Yes, that was the issue I was facing. I have just merged #81 so I assume we can remove this code right? However, in that PR I am adding wp-link="true" and we are expecting something like wp-link="{ "prefetch": true }". Should we transform wp-link="true" into wp-link="{ "prefetch": true }" in the directive or in PHP?

Apart from that, I made the changes manually and it works great! 🎉 👏

[luisherranz]

I've removed the manual wp-link injection and enqueued the scripts only on the frontend (my fault).

Should we transform wp-link="true" into wp-link="{ "prefetch": true }" in the directive or in PHP?

Yeah, but first we need to consider what prefetching strategy we want to enable here.