templates: introduce unit tests

These unit tests generate a random MF2-JSON post, convert it to
MF2-HTML using the template and then read it back using the
`microformats` crate.

The only problem is that it has a nasty bug with overstuffing implied
properties. This is being worked on:
https://gitlab.com/maxburon/microformats-parser/-/issues/7

For now the tests marked as ignored because they fail. But the
function itself that generates them should remain here for
documentation and potential code sharing with the `microformats`
crate, potentially even migrating to a subcrate there.

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