caddyhttp: enable qlog, controlled by QLOGDIR env (#6581)

Author: marten-seemann

go.mod

@@ -51,6 +51,7 @@ require (
 	github.com/Microsoft/go-winio v0.6.0 // indirect
 	github.com/antlr4-go/antlr/v4 v4.13.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/francoispqt/gojay v1.2.13 // indirect
 	github.com/fxamacker/cbor/v2 v2.6.0 // indirect
 	github.com/go-jose/go-jose/v3 v3.0.3 // indirect
 	github.com/go-kit/log v0.2.1 // indirect