Add: Dynamic problems for fitb questions.

[bjones1]

Depends on RunestoneInteractive/RunestoneComponents#1029. A MVP for dynamic problems.

.. fillintheblank:: fitb_dynamic
    :dynamic:
        a = random.randrange(0, 10)
        b = random.randrange(0, 10)

    What is {{=a}} + {{=b}}?

    -   :int(ans) == a + b: Correct!
        :int(ans) == a - b: That's subtraction.
        :int(ans) == a * b: That's multiplication.
        :float(ans) == approx(a / b): That's division.
        :x: I don't know what you're doing.

[bjones1]

Note that these test failures result from not having the updated Runestone components -- templated items such as {{=a}} raise an exception, since the components doesn't store source code for calculating a. All tests pass with the updated components.

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[bjones1]

I'd actually like to re-consider this after the last PR for improved testing is merged.

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[bjones1]

Let's leave this closed. If RunestoneInteractive/RunestoneComponents#1225 is merged, then I'll rewrite this for the bookserver.