server: support bigger json parser max string

Default from 50_000 -> 2_000_000

Author: rob-bygrave

server/src/main/java/org/ebean/monitor/Application.java

@@ -6,6 +6,11 @@
 public class Application {
 
   public static void main(String[] args) {
+    // avaje-json's JParser caps string values at jsonb.parserMaxStringBuffer (default 50 000).
+    // Postgres EXPLAIN plans can be much larger, so raise the limit before any jsonb class is
+    // loaded (Recyclers reads this as a static final at class-load time).
+    int planBufferSize = Config.getInt("ingest.planMaxStringBuffer", 2_000_000);
+    System.setProperty("jsonb.parserMaxStringBuffer", String.valueOf(planBufferSize));
     AvajeJex.start();
   }