apps: lc-compliance: Merge `CaptureBalanced` and `CaptureUnbalanced`

The above two classes have very similar implementations, in fact, the
only essential difference is how many requests are queued. `CaptureBalanced`
queues a predetermined number of requests, while `CaptureUnbalanced`
queues requests without limit.

This can be addressed by introducing a "capture" and a "queue" limit
into the `Capture` class, which determine at most how many requests
can be queued, and how many request completions are expected before
stopping.

Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>

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