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, 3 insertions, 4 deletions

diff --git a/cli/compilers/mod.rs b/cli/compilers/mod.rs
index a2abbe2aa..f6fc28d37 100644
--- a/cli/compilers/mod.rs
+++ b/cli/compilers/mod.rs
@@ -1,7 +1,7 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+use crate::ops::JsonResult;
 use deno_core::ErrBox;
 use futures::Future;
-use serde_json::Value;
 
 mod compiler_worker;
 mod js;
@@ -17,8 +17,7 @@ pub use ts::TargetLib;
 pub use ts::TsCompiler;
 pub use wasm::WasmCompiler;
 
-pub type CompilationResultFuture =
-  dyn Future<Output = Result<Value, ErrBox>> + Send;
+pub type CompilationResultFuture = dyn Future<Output = JsonResult>;
 
 #[derive(Debug, Clone)]
 pub struct CompiledModule {
@@ -27,4 +26,4 @@ pub struct CompiledModule {
 }
 
 pub type CompiledModuleFuture =
-  dyn Future<Output = Result<CompiledModule, ErrBox>> + Send;
+  dyn Future<Output = Result<CompiledModule, ErrBox>>;