[Rspamd] Initial custom ratelimit support

data/conf/rspamd/local.d/ratelimit.conf

@@ -1,18 +0,0 @@
-rates {
-  # Limit for all mail per recipient (burst 100, rate 2 per minute)
-  to = [100, 0.033333333];
-  # Limit for all mail per one source ip (burst 30, rate 1.5 per minute)
-  to_ip = [30, 0.025];
-  # Limit for all mail per one source ip and from address (burst 20, rate 1 per minute)
-  to_ip_from = [20, 0.01666666667];
-  # Limit for all bounce mail (burst 10, rate 2 per hour)
-  bounce_to = [10, 0.000555556];
-  # Limit for bounce mail per one source ip (burst 5, rate 1 per hour)
-  bounce_to_ip = [5, 0.000277778];
-  # Limit for all mail per authenticated user (burst 20, rate 1 per minute)
-  user = [20, 0.01666666667];
-}
-# If symbol is specified, then it is inserted instead of setting result
-#symbol = "R_RATELIMIT";
-whitelisted_rcpts = "postmaster,mailer-daemon";
-max_rcpt = 5;