Create script for Mythic Beasts DNS API requests

I am moving DNS provider from deSEC to Mythic Beasts. As part of this change, I
need to use Mythic Beast's DNS API [1] in the playbook.

I want to reduce the number of operations that are made by grouping several
records together. To do this, I can use the "Identifying records to replace"
method from their DNS tutorial. [2] This provides a way to specify which
records should be replaced by the new records that you PUT onto the endpoint.

To use this, you specify the records via a url-encoded series of select
queries. Then, you can combine them into a disjunction of conjunctions like so:

?select=type%3DA%26host%3Dchat&select=type%3DAAAA

This gets split into two separate queries which are then decoded into:

type=A&host=chat
type=AAAA

Then, these records are replaced by whichever records are specified in the PUT
request.

It's painful to write these by hand, so write a script to generate them
automatically. Then, they should be pasted into the playbook when the desired
records update. If this happens often, we should make the playbook call the
script to get the values directly.

As an additional benefit, the script definitively states which records are
"owned" by the playbook. This is because the records specified in the script
are the ones that will be replaced each time the playbook is run.

Finally, since we've now added python to the playbook for the first time, add
the black linter to keep the code style in check.

[1] https://www.mythic-beasts.com/support/api/dnsv2
[2] https://www.mythic-beasts.com/support/api/dnsv2/tutorial

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