feat: add net module to utility process (#40017)

* chore: initial prototype of net api from utility process

* chore: update url loader to work on both browser and utility processes

* chore: add net files to utility process bundle

* chore: re-add app ready check but only on main process

* chore: replace browser thread dcheck's with sequence checker

* refactor: move url loader from browser to common

* refactor: move net-client-request.ts from browser to common

* docs: add utility process to net api docs

* refactor: move net module app ready check to browser only

* refactor: switch import from main to common after moving to common

* test: add basic net module test for utility process

* refactor: switch browser pid with utility pid

* refactor: move electron_api_net from browser to common

* chore: add fetch to utility net module

* chore: add isOnline and online to utility net module

* refactor: move net spec helpers into helper file

* refactor: break apart net module tests

Adds two additional net module test files: `api-net-session-spec.ts` for
tests that depend on a session being available (aka depend on running on
the main process) and `api-net-custom-protocols-spec.ts` for custom
protocol tests. This enables running `api-net-spec.ts` in the utility
process.

* test: add utility process mocha runner to run net module tests

* docs: add utility process to net module classes

* refactor: update imports in lib/utility to use electron/utility

* chore: check browser context before using in main process

Since the browser context supplied to the SimpleURLLoaderWrapper can now
be null for use in the UtilityProcess, adding a null check for the main
process before use to get a more sensible error if something goes wrong.

Co-authored-by: Cheng Zhao <github@zcbenz.com>

* chore: remove test debugging

* chore: remove unnecessary header include

* docs: add utility process net module limitations

* test: run net module tests in utility process individually

* refactor: clean up prior utility process net tests

* chore: add resolveHost to utility process net module

* chore: replace resolve host dcheck with sequence checker

* test: add net module tests for net.resolveHost

* docs: remove utility process limitation for resolveHost

---------

Co-authored-by: deepak1556 <hop2deep@gmail.com>
Co-authored-by: Cheng Zhao <github@zcbenz.com>

docs/api/client-request.md

@@ -2,7 +2,7 @@
 
 > Make HTTP/HTTPS requests.
 
-Process: [Main](../glossary.md#main-process)<br />
+Process: [Main](../glossary.md#main-process), [Utility](../glossary.md#utility-process)<br />
 _This class is not exported from the `'electron'` module. It is only available as a return value of other methods in the Electron API._
 
 `ClientRequest` implements the [Writable Stream](https://nodejs.org/api/stream.html#stream_writable_streams)

docs/api/incoming-message.md

@@ -2,7 +2,7 @@
 
 > Handle responses to HTTP/HTTPS requests.
 
-Process: [Main](../glossary.md#main-process)<br />
+Process: [Main](../glossary.md#main-process), [Utility](../glossary.md#utility-process)<br />
 _This class is not exported from the `'electron'` module. It is only available as a return value of other methods in the Electron API._
 
 `IncomingMessage` implements the [Readable Stream](https://nodejs.org/api/stream.html#stream_readable_streams)

docs/api/net.md

@@ -2,7 +2,7 @@
 
 > Issue HTTP/HTTPS requests using Chromium's native networking library
 
-Process: [Main](../glossary.md#main-process)
+Process: [Main](../glossary.md#main-process), [Utility](../glossary.md#utility-process)
 
 The `net` module is a client-side API for issuing HTTP(S) requests. It is
 similar to the [HTTP](https://nodejs.org/api/http.html) and
@@ -119,6 +119,9 @@ protocol.handle('https', (req) => {
 })
 ```
 
+Note: in the [utility process](../glossary.md#utility-process) custom protocols
+are not supported.
+
 ### `net.isOnline()`
 
 Returns `boolean` - Whether there is currently internet connection.