Support for all sources in network protocol search queries

[kimhanbeom]

• Add NetworkOptFilter struct to allow network event search queries to request all sources.
• Add functions for all source search.
• Change the sorting of event search results for all sources to timestamp, source.
• Modify network event search queries.
  • Change the type of filter from NetworkFilter to Option<NetworkOptFilter>.
  • Add request_from_peer as a parameter to the queries.
  • Change the paged_events_in_cluster macro argument to handle all source requests.
  • Add the source field to the network event search result structure.

Close: #770