Suricata issues linked to Shovel

[erdnaxe]

• Relative pcre with negative distance to previous content match, https://redmine.openinfosecfoundation.org/issues/8133
  Required to extract multiple flags from the same stream.
• websocket: add option to log payloads in Eve websocket events, https://redmine.openinfosecfoundation.org/issues/7844
  Required to print websocket payloads in webapp.
• Add decompression support to pcap-file capture method, https://redmine.openinfosecfoundation.org/issues/8132
  Required to handle compressed pcap files. Might also allow writing pcap.gz using libarchive (?).
• rust: zero-dependency crate suricata-core. https://redmine.openinfosecfoundation.org/issues/7666
  Required for rewriting Lua plugins to Rust, see Rewrite suricata-tcp/udp-sqlite-output plugins to Rust #11