Raise mem request to 2Gi. (#487)

This change, reduced the amount of failed tests from 55 to 24 (> 50% reduction)

:red_circle: CI https://ci.stackable.tech/view/02%20Operator%20Tests%20(custom)/job/kafka-operator-it-custom/15/

Author: razvan

docs/modules/ROOT/pages/usage.adoc

@@ -316,7 +316,7 @@ brokers:
       config:
         resources:
           memory:
-            limit: '1Gi'
+            limit: '2Gi'
           cpu:
             min: '500m'
             max: '4'

rust/crd/src/lib.rs

@@ -276,7 +276,7 @@ impl KafkaCluster {
                 max: Some(Quantity("4".to_owned())),
             },
             memory: MemoryLimits {
-                limit: Some(Quantity("1Gi".to_owned())),
+                limit: Some(Quantity("2Gi".to_owned())),
                 runtime_limits: NoRuntimeLimits {},
             },
             storage: Storage {