Make rate-limit optional [AI-assisted]

Enabled by default for kustvakt.conf and kustvakt-test.conf

The RateLimitFilter is now registered as a @Provider and has been
removed from @ResourceFilters.

Change-Id: I281e42614c2bb58cb84766969e6b3cae1f89c172
diff --git a/src/main/resources/kustvakt.conf b/src/main/resources/kustvakt.conf
index 8bd0ff9..497efd4 100644
--- a/src/main/resources/kustvakt.conf
+++ b/src/main/resources/kustvakt.conf
@@ -62,6 +62,8 @@
 
 # Rate limiting for authenticated users
 #
+# Enable or disable rate limiting (true/false)
+ratelimit.enabled = true
 # Number of requests allowed per time period
 ratelimit.refill.tokens = 60
 # Time period for token refill (format: 1S, 30M, 1H, 1D)