* return empty array when no peers found
* add missing query params to endpoint factory
* fix validator endpoints in endpoint factory
* peers test
* Move API param handling to separate file
* Handle comma-separated query parameters
* extract creating DefaultErrorJson objects
* do not use default http client for proxying
Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>