transformers reload config on SIGHUP and major refacto #816

Job	Run time
metrics (1.21)	23s
int (1.20, config)	1m 36s
dev (ubuntu-22.04, 1.20, dnsutils)	53s
int (1.20, clientquery_dnstaptcp)	1m 45s
dev (ubuntu-22.04, 1.20, collectors)	1m 59s
int (1.20, clientquery_dnstapunix)	1m 48s
dev (ubuntu-22.04, 1.20, loggers)	3m 3s
dev (ubuntu-22.04, 1.20, transformers)	56s
int (1.21, config)	34s
dev (ubuntu-22.04, 1.20, netlib)	33s
int (1.21, clientquery_dnstaptcp)	30s
int (1.21, clientquery_dnstapunix)	37s
dev (ubuntu-22.04, 1.21, dnsutils)	54s
dev (ubuntu-22.04, 1.21, collectors)	1m 45s
dev (ubuntu-22.04, 1.21, loggers)	2m 50s
dev (ubuntu-22.04, 1.21, transformers)	45s
dev (ubuntu-22.04, 1.21, netlib)	41s
dev (macos-latest, 1.21, dnsutils)	1m 22s
dev (macos-latest, 1.21, collectors)	1m 40s
dev (macos-latest, 1.21, loggers)	3m 18s
dev (macos-latest, 1.21, transformers)	1m 38s
dev (macos-latest, 1.21, netlib)	39s
	30m 9s

Provide feedback