Add alert relabelling for Thanos Rule based on Prometheus' logic #4125
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Signed-off-by: Christian Schulz trutty3@gmail.com
Fixes #4122
Changes
Add Prometheus' alert relabelling features to Thanos Rule.
Add command line flag to supply the configuration via YAML or file.
Verification
Tested locally with a unit test.
The relabelling logic itself is also tested within Prometheus.