feat(cli): allow Hermes to be run post-bundle

[tido64]

Description

Run hermesc after the bundle has been created.

Test plan

Enable Hermes:

diff --git a/packages/test-app/package.json b/packages/test-app/package.json
index bf87fe69..07b4cd20 100644
--- a/packages/test-app/package.json
+++ b/packages/test-app/package.json
@@ -141,7 +141,8 @@
           "android": {
             "bundleOutput": "dist/main+esbuild.android.bundle",
             "sourcemapOutput": "dist/main+esbuild.android.bundle.map",
-            "assetsDest": "dist/res"
+            "assetsDest": "dist/res",
+            "hermes": true
           },
           "ios": {
             "bundleOutput": "dist/main+esbuild.ios.jsbundle",

Bundle:

cd packages/test-app
yarn build --dependencies
yarn bundle+esbuild --dev false

Verify that hermesc was only run for Android:

% ls dist
total 22960
drwxr-xr-x  3 tido  staff       96 26 sep 12:03 assets/
-rw-r--r--  1 tido  staff   631864 26 sep 12:04 main+esbuild.android.bundle
-rw-r--r--  1 tido  staff   599720 26 sep 12:04 main+esbuild.android.bundle.hbc
-rw-r--r--  1 tido  staff   477992 26 sep 12:04 main+esbuild.android.bundle.hbc.map
-rw-r--r--  1 tido  staff  3067887 26 sep 12:04 main+esbuild.android.bundle.map
-rw-r--r--  1 tido  staff   625665 26 sep 12:04 main+esbuild.ios.jsbundle
-rw-r--r--  1 tido  staff  3045528 26 sep 12:04 main+esbuild.ios.jsbundle.map
-rw-r--r--  1 tido  staff   627559 26 sep 12:05 main+esbuild.windows.bundle
-rw-r--r--  1 tido  staff  3062400 26 sep 12:05 main+esbuild.windows.bundle.map
drwxr-xr-x  3 tido  staff       96 26 sep 12:03 res/

Also verify that:

• Moving "hermes": true up to the "global" area enables Hermes for all platforms
• "hermes": { "flags": ["-out", "index.jsbundle"] } (and other options) is accepted

[renchap]

• Do we still want to keep the .js output?

This might be a good idea, for tools like Sentry. I am not sure if they can work with only the sourcemap.

[kelset]

LGTM

tested locally (all various options that needed testing) and all worked as expected 👍