transformers reload config on SIGHUP and major refacto #823

Job	Run time
dev (ubuntu-22.04, 1.20, dnsutils)	46s
metrics (1.21)	42s
dev (ubuntu-22.04, 1.20, collectors)	2m 30s
int (1.20, config)	2m 40s
dev (ubuntu-22.04, 1.20, loggers)	3m 38s
int (1.20, clientquery_dnstaptcp)	1m 48s
dev (ubuntu-22.04, 1.20, transformers)	58s
int (1.20, clientquery_dnstapunix)	2m 33s
dev (ubuntu-22.04, 1.20, netlib)	1m 16s
int (1.21, config)	25s
dev (ubuntu-22.04, 1.21, dnsutils)	1m 5s
int (1.21, clientquery_dnstaptcp)	28s
dev (ubuntu-22.04, 1.21, collectors)	2m 25s
int (1.21, clientquery_dnstapunix)	1m 17s
dev (ubuntu-22.04, 1.21, loggers)	2m 54s
dev (ubuntu-22.04, 1.21, transformers)	1m 4s
dev (ubuntu-22.04, 1.21, netlib)	1m 11s
dev (macos-latest, 1.21, dnsutils)	22s
dev (macos-latest, 1.21, collectors)	2m 14s
dev (macos-latest, 1.21, loggers)	3m 12s
dev (macos-latest, 1.21, transformers)	1m 22s
dev (macos-latest, 1.21, netlib)	18s
	35m 8s

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