services: guix: Add guix-build-coordinator-service-type.
* gnu/services/guix.scm (<guix-build-coordinator-configuration>): New record
type.
(guix-build-coordinator-configuration, guix-build-coordinator-configuration?,
guix-build-coordinator-configuration-package,
guix-build-coordinator-configuration-user,
guix-build-coordinator-configuration-group,
guix-build-coordinator-configuration-datastore-uri-string,
guix-build-coordinator-configuration-agent-communication-uri-string,
guix-build-coordinator-configuration-client-communication-uri-string,
guix-build-coordinator-configuration-allocation-strategy,
guix-build-coordinator-configuration-hooks,
guix-build-coordinator-configuration-guile,
make-guix-build-coordinator-start-script,
guix-build-coordinator-shepherd-services, guix-build-coordinator-activation,
guix-build-coordinator-account): New procedures.
(guix-build-coordinator-service-type): New variable.
* gnu/tests/guix.scm (%test-guix-build-coordinator): New variable.
* doc/guix.texi (Guix Services): Document it.
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