Add a large-context group

allowing users to access larger context by request [AI-assisted, #745]

The group is automatically generated at initialization, if it doesn't
exist. The size of the context may be larger than the usual max token
context for other users. It is configurable with
"max.token.context.size.large" property in the kustvakt.config file.

Change-Id: I83986a858a3646f7061277cdbba1f4327ebdecfe
diff --git a/src/test/resources/kustvakt-test.conf b/src/test/resources/kustvakt-test.conf
index bb8997d..9cd1a9e 100644
--- a/src/test/resources/kustvakt-test.conf
+++ b/src/test/resources/kustvakt-test.conf
@@ -49,6 +49,8 @@
 # Virtual corpus and queries
 max.user.persistent.queries = 5
 max.token.context.size = 40
+max.token.context.size.large = 50
+
 # default false
 vc.list.statistics.enabled = true