add envoy filters to support user context ingestion
- Related to ADR data-flow/ingestion 52
- This MR introduces new envoy filters to seismic service namespace.
- If the request contains Internal Service Account Token and x-on-behalf-of header is not empty or null, then the x-user-id header will be set to x-on-behalf-of header
- Related to Seismic MR 818
Edited by saketh somaraju [EPAM]