LittleHorse server instance initialization

[eduwercamacaro]

LittleHorse server starts three dependencies during bootstrap:

• Kafka Streams Core Topology
• Kafka Streams Timer Topology
• Javalin http server
• Grpc Server

All of these services start at the same time, and it usually takes some milliseconds to start. The problem that I see with this approach is that both the gRPC server and Javalin start faster than Kafka Streams topologies, in which case the gRPC server and HTTP clients receive an error status code that says the service is not available yet. IMO, this is annoying from a client perspective because clients need to implement a logic that retries this temporary status code until the server instance is ready.