Set kafka heap size. To be later configured from SOC

Signed-off-by: reyesj2 <94730068+reyesj2@users.noreply.github.com>

salt/kafka/enabled.sls

@@ -23,6 +23,8 @@ so-kafka:
       - sobridge:
         - ipv4_address: {{ DOCKER.containers['so-kafka'].ip }}
     - user: kafka
+    - environment:
+      - KAFKA_HEAP_OPTS=-Xmx2G -Xms1G
     - extra_hosts:
     {% for node in KAFKANODES %}
       - {{ node }}:{{ KAFKANODES[node].ip }}