Add evaluation database workers.

Evaluation registration involves running a large number of SQL queries. This
can cause some database worker starvation as well as some contention. To avoid
this issue, spawn database workers dedicated to evaluation registration.

* src/cuirass/database.scm (%db-registration-channel): New variable.
(with-db-registration-worker-thread, with-registration-workers): New macros.
(with-db-worker-thread-no-timeout): Remove it.
(db-register-builds): Run registration in dedicated database workers using
"with-db-registration-worker-thread" macro.
* bin/cuirass.in (main): Spawn database registration workers by calling
"with-registration-workers" macro.

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