refactor: Use Tokio's single-threaded runtime (#3844)

This change simplifies how we execute V8. Previously V8 Isolates jumped
around threads every time they were woken up. This was overly complex and
potentially hurting performance in a myriad ways. Now isolates run on
their own dedicated thread and never move.

- blocking_json spawns a thread and does not use a thread pool
- op_host_poll_worker and op_host_resume_worker are non-operational
- removes Worker::get_message and Worker::post_message
- ThreadSafeState::workers table contains WorkerChannel entries instead
  of actual Worker instances.
- MainWorker and CompilerWorker are no longer Futures.
- The multi-threaded version of deno_core_http_bench was removed.
- AyncOps no longer need to be Send + Sync

This PR is very large and several tests were disabled to speed
integration:
- installer_test_local_module_run
- installer_test_remote_module_run
- _015_duplicate_parallel_import
- _026_workers

1 files changed, 5 insertions, 14 deletions

diff --git a/core/examples/http_bench.rs b/core/examples/http_bench.rs
index 8151c4575..fa570acfb 100644
--- a/core/examples/http_bench.rs
+++ b/core/examples/http_bench.rs
@@ -164,27 +164,18 @@ fn main() {
   isolate.register_op("write", http_op(op_write));
   isolate.register_op("close", http_op(op_close));
 
-  let multi_thread = args.iter().any(|a| a == "--multi-thread");
-
   println!(
     "num cpus; logical: {}; physical: {}",
     num_cpus::get(),
     num_cpus::get_physical()
   );
-  let mut builder = tokio::runtime::Builder::new();
-  let builder = if multi_thread {
-    println!("multi-thread");
-    builder.threaded_scheduler()
-  } else {
-    println!("single-thread");
-    builder.basic_scheduler()
-  };
 
-  let mut runtime = builder
-    .enable_io()
+  let mut runtime = tokio::runtime::Builder::new()
+    .basic_scheduler()
+    .enable_all()
     .build()
-    .expect("Unable to create tokio runtime");
-  let result = runtime.block_on(isolate.boxed());
+    .unwrap();
+  let result = runtime.block_on(isolate.boxed_local());
   js_check(result);
 }