Release v0.28.0

What’s Changed

Features

• Feature/SK-1609 | Only init OTEL if configured, init tracer @stefanhellander (#920)
• Feature/SK-1261 | Split Learning in FEDn @FrankJonasmoelle (#776)
• Feature/SK-1353 | Extended tests in async-clients @benjaminastrand (#844)
• Feature/SK-1605 | Improved error handling and grpc retries in python client @carl-andersson (#919)
• Feature/SK-1364 | Start existing session via API Client @niklastheman (#909)
• Feature/SK-1580 | Read json from request more robustly @niklastheman (#914)
• Feature/SK-1595 | Api client for server functions + example @viktorvaladi (#912)
• Feature/SK-1598 | Integrate OpenTelemetry with controller, combiner @stefanhellander (#915)
• Feature/SK-1596 | Added routes and ClientAPI methods @carl-andersson (#911)
• Feature/SK-1579 | Add a field 'updated_at' similar to 'committed_at' @niklastheman (#910)

Fixes

• Bugfix/SK-1602 | Telemetries are not getting cleared @carl-andersson (#918)
• Bugfix/SK-1591 | MongoClient was initialized before fork @carl-andersson (#908)