Remove dev-mode Hermes bytecode experiment

Summary:
Changelog:
* **[Internal]**: Remove experimental `metro-hermes-compiler` package.
* **[Fix]**: Remove spammy warning about a possible EventEmitter memory leak.

Removes the `metro-hermes-compiler` package and associated support for compiling JS to bytecode within Metro. This code was part of an unreleased experiment to offload Hermes bytecode compilation in React Native to Metro.

Reviewed By: robhogan

Differential Revision: D43604706

fbshipit-source-id: a449a51435c3eecef42ff8e7951bebb4661aee9c

Author: motiz88

packages/metro-hermes-compiler/.npmignore

@@ -12,20 +12,13 @@
 'use strict';
 
 export type ModuleMap = $ReadOnlyArray<[number, string]>;
-export type BytecodeModuleMap = $ReadOnlyArray<[number, Array<Buffer>]>;
 
 export type Bundle = {
   +modules: ModuleMap,
   +post: string,
   +pre: string,
 };
 
-export type BytecodeBundle = {
-  +modules: BytecodeModuleMap,
-  +post: Array<Buffer>,
-  +pre: Array<Buffer>,
-};
-
 export type DeltaBundle = {
   +added: ModuleMap,
   +modified: ModuleMap,

packages/metro-hermes-compiler/README.md

@@ -22,7 +22,6 @@
     "metro-babel-transformer": "0.76.0",
     "metro-cache": "0.76.0",
     "metro-cache-key": "0.76.0",
-    "metro-hermes-compiler": "0.76.0",
     "metro-source-map": "0.76.0",
     "metro-transform-plugins": "0.76.0",
     "nullthrows": "^1.1.1"