v0.6.0: Hybrid Search 🔎 and Custom Metadata! 🚀

What's Changed

• Add custom metadata to messages in the form of arbitrarily deep json documents
• Hybrid vector similarity search across both message text embeddings and metadata
  by @danielchalef in #85

Bug fixes and improvements

• put to deleted session is a 400 error by @danielchalef in #82
• re-expose nlp and postgres ports to aid development by @danielchalef in #83
• refactor testutils, exclude from build, modify build/test triggers by @danielchalef in #84

Full Changelog: v0.5.1...v0.6.0