Add umockdev_testbed_load_evemu_events_from_string() #1166

Job	Run time
OS (apt-docker.io/amd64/ubuntu:devel)	2m 25s
OS (apt-docker.io/amd64/ubuntu:latest)	2m 8s
OS (apt-docker.io/amd64/ubuntu:rolling)	1m 58s
OS (apt-docker.io/i386/debian:testing)	2m 2s
OS (apt-docker.io/amd64/debian:testing)	2m 3s
OS (dnf-registry.fedoraproject.org/fedora:latest)	2m 3s
OS (dnf-registry.fedoraproject.org/fedora:rawhide)	2m 2s
OS (alpine-docker.io/alpine)	30s
OS (alpine-docker.io/i386/alpine)	39s
OS (alpine@gudev-docker.io/alpine)	32s
OS (nix-docker.io/nixos/nix)	1m 15s
OS (gentoo-)	20m 45s
OS (alpine@gudev-alpine, EXTRA_PACKAGES=libgudev-dev)	34s
	38m 56s

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