opentelemetry target allocator

The Target Allocator (TA) is an optional component of the OpenTelemetry Operator that discovers Prometheus targets and shards them across a fleet of OpenTelemetry Collector instances. It provides HTTP endpoints that Collectors use to fetch their assigned scrape targets (e.g. /jobs, /jobs/{job}/targets, /scrape_configs) and supports config-file and CR-based discovery.