5.0.0-next.0

Changes

• Migrate to TypeScripts
• Add swagger support and completly redesign setup routes etc. (https://github.com/lukeautry/tsoa)
• Migrate to ElastAlert2
• Update npm packages
• Optimize docker image size
• Cleanup project a bit

Removals

• [WIP] GET /config - empty endpoint
• [WIP] POST /config - empty endpoint
• [WIP] POST /download - for security reasons