add a "readiness" API that can be used to determine if various Malcolm services are ready

[mmguero]

Malcolm Services Readiness Status

GET - /mapi/ready

Returns true or false indicating the readiness status of various Malcolm services.

Example output:

{
  "arkime": true,
  "dashboards": true,
  "dashboards_maps": true,
  "filebeat_tcp": false,
  "freq": true,
  "logstash_lumberjack": true,
  "logstash_pipelines": true,
  "netbox": true,
  "opensearch": true,
  "pcap_monitor": true,
  "zeek_extracted_file_logger": true,
  "zeek_extracted_file_monitor": true
}