Attributes to Arbitrary Elements, (Definition List) about panflute HOT 4 OPEN

Feel free to send a PR.

When writing panflute, at some point I thought it might be good to allow attributes on all elements. At the end I decided against it to stay close to what Pandoc does (so we only allow attributes in elements that can have an attribute in Pandoc).

That said, I can think of cases where you want to want to add attributes, so I'm open to a PR. The only issue is that, as a user, you might need to remove the attributes before the data gets dumped back to Pandoc.

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I checked with the pandoc, API, that wouldn't work...
Telling you quickly what I'm trying to achieve is to make a theorem-like environment, and have conditional rendering depending on the format...
What I'll end up doing is tearing apart the definition List, (on the filter), and turning it in to segments surrounded by RawInline so I can squeeze in the corresponding tags, my main need is
Pseudo-Markdown (this weird syntax I want to make filters for)
Pseudo-MArkdown -> HTML
Pseudo-MArkdown -> Markdown (Readable Markdown)
Pseudo-MArkdown -> Latex

So by surrounding the tags, with the corresponding tags in function of the class in the attribute block I'm implementing, I'll end up having the final render I need.

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Can you give me an example of how the pseudo markup should look like, ideally?

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This is the first concern I have, later, I'll try and put tables, figures, and different kinds of pictures with pandoc, In a way that if fitted to the need, (but I already saw pandoc behaves as expected in does cases)
The idea is to have many kinds of definitions, for theorems, math and languages definitions, corollary, notes, remarks, and so on, that structurally are similar.

Theorem {#id .class-one .class-two data-set="theorems"}
:   This is the body of the definition with some formulas as follows $x^2 = \int_a^b f(t)dt$ and a
    longer formula as $$ \sum_{n=0}^{\infty} \frac{1}{n}$$

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