Add umockdev_testbed_load_evemu_events_from_string() #1159

Job	Run time
OS (apt-docker.io/amd64/ubuntu:devel)	46s
OS (apt-docker.io/amd64/ubuntu:latest)	34s
OS (apt-docker.io/amd64/ubuntu:rolling)	51s
OS (apt-docker.io/i386/debian:testing)	51s
OS (apt-docker.io/amd64/debian:testing)	48s
OS (dnf-registry.fedoraproject.org/fedora:latest)	43s
OS (dnf-registry.fedoraproject.org/fedora:rawhide)	35s
OS (alpine-docker.io/alpine)	16s
OS (alpine-docker.io/i386/alpine)	13s
OS ([email protected]/alpine)	11s
OS (nix-docker.io/nixos/nix)	1m 10s
OS (gentoo-)	23m 45s
OS (alpine@gudev-alpine, EXTRA_PACKAGES=libgudev-dev)	14s
	30m 57s

Provide feedback