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, 2 insertions, 1 deletions

diff --git a/cli/ops/fs.rs b/cli/ops/fs.rs
index d5ce59f99..1112db495 100644
--- a/cli/ops/fs.rs
+++ b/cli/ops/fs.rs
@@ -4,6 +4,7 @@ use super::dispatch_json::{blocking_json, Deserialize, JsonOp, Value};
 use crate::deno_error::DenoError;
 use crate::deno_error::ErrorKind;
 use crate::fs as deno_fs;
+use crate::ops::dispatch_json::JsonResult;
 use crate::ops::json_op;
 use crate::state::ThreadSafeState;
 use deno_core::*;
@@ -233,7 +234,7 @@ macro_rules! to_seconds {
 fn get_stat_json(
   metadata: fs::Metadata,
   maybe_name: Option<String>,
-) -> Result<Value, ErrBox> {
+) -> JsonResult {
   // Unix stat member (number types only). 0 if not on unix.
   macro_rules! usm {
     ($member: ident) => {{