Plugin Support

[ZBXNEXT-9024] increased maximal Zabbix agent 2 plugin capacity from 100 to 1000

* commit 'a286fe9073750625753e2b7b59c132e3d6cb5ff1':
  ...G...... [ZBXNEXT-9024] removed unneeded code
  ...G...... [ZBXNEXT-9024] added default capacity initialization
  ...G...... [ZBXNEXT-9024] increased maximal Zabbix agent 2 plugin capacity from 100 to 1000