*: remove dependency on github.com/prometheus/prometheus #2009
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We depend on the Prometheus repository only for the
github.com/prometheus/prometheus/pkg/labels
package and from this package, we use only theMatcher
struct.Knowing that this code hasn't evolved for years now, it seems safe and simpler to duplicate it in AlertManager rather than the heavy dependency we have right now (see #2008). In addition Prometheus has an indirect dependency on
github.com/hashicorp/memberlist
and many other Hashicorp libs which can cause version changes whenever we need to bump github.com/prometheus/prometheus.