src: add initial support for single executable applications

Compile a JavaScript file into a single executable application:

```console
$ echo 'console.log(`Hello, ${process.argv[2]}!`);' > hello.js

$ cp $(command -v node) hello

$ npx postject hello NODE_JS_CODE hello.js \
    --sentinel-fuse NODE_JS_FUSE_fce680ab2cc467b6e072b8b5df1996b2

$ npx postject hello NODE_JS_CODE hello.js \
    --sentinel-fuse NODE_JS_FUSE_fce680ab2cc467b6e072b8b5df1996b2 \
    --macho-segment-name NODE_JS

$ ./hello world
Hello, world!
```

Signed-off-by: Darshan Sen <raisinten@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/45038
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michael Dawson <midawson@redhat.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

node.gyp

@@ -151,7 +151,8 @@
 
       'include_dirs': [
         'src',
-        'deps/v8/include'
+        'deps/v8/include',
+        'deps/postject'
       ],
 
       'sources': [
@@ -449,6 +450,7 @@
 
       'include_dirs': [
         'src',
+        'deps/postject',
         '<(SHARED_INTERMEDIATE_DIR)' # for node_natives.h
       ],
       'dependencies': [
@@ -523,6 +525,7 @@
         'src/node_report.cc',
         'src/node_report_module.cc',
         'src/node_report_utils.cc',
+        'src/node_sea.cc',
         'src/node_serdes.cc',
         'src/node_shadow_realm.cc',
         'src/node_snapshotable.cc',
@@ -633,6 +636,7 @@
         'src/node_report.h',
         'src/node_revert.h',
         'src/node_root_certs.h',
+        'src/node_sea.h',
         'src/node_shadow_realm.h',
         'src/node_snapshotable.h',
         'src/node_snapshot_builder.h',
@@ -675,6 +679,7 @@
         'src/util-inl.h',
         # Dependency headers
         'deps/v8/include/v8.h',
+        'deps/postject/postject-api.h'
         # javascript files to make for an even more pleasant IDE experience
         '<@(library_files)',
         '<@(deps_files)',