give tokio threads a more convenient name for monitoring purposes

backend/telemetry_core/benches/subscribe.rs

@@ -33,6 +33,7 @@ pub fn benchmark_subscribe_speed(c: &mut Criterion) {
                     },
                     CoreOpts {
                         worker_threads: Some(16),
+                        num_aggregators: Some(1),
                         ..Default::default()
                     },
                     ShardOpts {

backend/telemetry_core/src/main.rs

@@ -98,6 +98,7 @@ fn main() {
     tokio::runtime::Builder::new_multi_thread()
         .enable_all()
         .worker_threads(worker_threads)
+        .thread_name("telemetry_core_worker")
         .build()
         .unwrap()
         .block_on(async {

backend/telemetry_shard/src/main.rs

@@ -107,6 +107,7 @@ fn main() {
     tokio::runtime::Builder::new_multi_thread()
         .enable_all()
         .worker_threads(worker_threads)
+        .thread_name("telemetry_shard_worker")
         .build()
         .unwrap()
         .block_on(async {