fix(runtime): excessive latency introduced by sleep (#2298)

When recovering from `EAGAIN`, the `@jsii/runtime` recently added a
synchronous sleep for 50 milliseconds. However in large and complex
applications, this can add up to a lot of time, as worst case scenario,
the sleep can occur before and after each call (once on read, once on
write).

This change removes the `sleep` until we come up with a better solution.

Fixes #2284



---

By submitting this pull request, I confirm that my contribution is made under the terms of the [Apache 2.0 license].

[Apache 2.0 license]: https://www.apache.org/licenses/LICENSE-2.0

.all-contributorsrc

@@ -983,6 +983,33 @@
         "bug"
       ]
     },
+    {
+      "login": "ThomasSteinbach",
+      "name": "Thomas Steinbach",
+      "avatar_url": "https://avatars0.githubusercontent.com/u/1683246?v=4",
+      "profile": "https://github.com/ThomasSteinbach",
+      "contributions": [
+        "bug"
+      ]
+    },
+    {
+      "login": "Ophirr33",
+      "name": "Ty Coghlan",
+      "avatar_url": "https://avatars2.githubusercontent.com/u/15920577?v=4",
+      "profile": "https://ty.coghlan.dev/",
+      "contributions": [
+        "bug"
+      ]
+    },
+    {
+      "login": "slotnick",
+      "name": "Dave Slotnick",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/918175?v=4",
+      "profile": "https://github.com/slotnick",
+      "contributions": [
+        "bug"
+      ]
+    },
     {
       "login": "majasb",
       "name": "Maja S Bratseth",