Allow writing pins in multiple formats

[lbm364dl]

Closes #788.

Allowing multiple types in pin_write required some minor tweaks in pin_read. Instead of just choosing an arbitrary type from those available to read from, I also added a type argument in pin_read.

[juliasilge]

Was there more you wanted to do here before a review, @lbm364dl? I notice it is still draft.

[lbm364dl]

Was there more you wanted to do here before a review, @lbm364dl? I notice it is still draft.

Yes, my intention was to address this thing I mentioned in the linked issue:

If I have larger files, ideally I wouldn't want users to download a CSV they're not even going to use, because they would just use the other compressed/fast format

I didn't have time to look into that. But it should be independent anyway. I can try in another PR. What is present here should already be enough to close the issue.

A review is more than welcome.

[juliasilge]

I kind of wonder if we should just error and refuse to read if people try to read without type for a pin with multiple types, but we can try this out and see how people experience it.

Thanks for this contribution, @lbm364dl!

[juliasilge]

I couldn't get the call to work correctly in this case for the error, so we'll just go with this for now.

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