Summary information

1. Documentation: Remove the field description that needs to pass in the creation time and update time when creating.
2. delete update_time and create_time from define of admin API .
3. Certificate information is parsed from the certificate body without additional storage.

Actually. we need confrim all of the core resource.

• consumer
• consumer_group
• discovery_nodes
• global_rule
• plugin_config
• plugins
• proto
• route
• service
• ssl
  validity_end
  validity_start
  exptime
• stream_route
• upstream