Extract tracing into dedicated crate

[Mirko-von-Leipzig]

Summary

• Add the miden-node-tracing facade crate for canonical attributes, event/span macros, error reports, and tracing runtime integration.
• Move OpenTelemetry setup, gRPC propagation, panic handling, span helpers, and traced blocking spawns out of miden-node-utils.
• Route workspace consumers and proc-macro expansions through the facade while re-exporting the upstream tracing types and macros required by applications and generated code.
• Move the tracing unit and compile-fail tests with their implementation.

Changelog

changelog = "none"
reason    = "Internal tracing infrastructure extraction."