Name log fields, metrics and the Core Rule Set package for what they are (closes #192)

Log field, metric, action and event names now say what they count
and, for timings, the unit. Package internal/waf is internal/coreruleset.

Model: opus-5-5

internal/discriminator/ratelimits.go

@@ -29,8 +29,8 @@ func (rateLimits) check(_ context.Context, rq *request, now time.Time) *verdict
 	}
 
 	rq.limitPercent, rq.bytesPercent = rq.limitPercentages()
-	rq.line.LimitPercent, rq.line.LimitPercentSetting = rq.limitPercent.logged()
-	rq.line.BytesPercent, rq.line.BytesPercentSetting = rq.bytesPercent.logged()
+	rq.line.RateLimitPercent, rq.line.RateLimitPercentSetting = rq.limitPercent.logged()
+	rq.line.BytesLimitPercent, rq.line.BytesLimitPercentSetting = rq.bytesPercent.logged()
 
 	counts, hit, over := rq.h.limiter.Count(rq.h.clientGroup(rq.client), now,
 		rq.limitPercent.percent)