tael-server: OTLP ingest, tiered storage, and the REST/gRPC query API.
Shipped as a library so the tael binary can embed it behind tael serve
(a single cargo install), while still being usable as a standalone crate.
[run] is the default CLI-style entrypoint; [run_embedded] starts the same
server in quiet mode for in-process integrations. [ServerConfig] configures
the listeners and storage.