feat: netLog API for dynamic logging control (#13068)

* Introduce `net.{start|stop}Logging()`

- Slight regression right now as Electron won't automatically start logging net-logs at launch, will soon be fixed
- To implement callback for async controls

* Add `net.isLogging` & optional callback param for `net.stopLogging()`

* Fix small regression on --log-net-log

--log-net-log should work again

* Error on empty file path

* Only start with valid file path

* Remove unused var

* Allow setting log file path before URLRequestContextGetter starts logging

* Add net log tests

* Remove redundant checks

* Use brightray::NetLog

* Clean up code

* Should automatically stop listening

* 🎨 Attempt to fix styles

* Only run non-null callback

* Dump file to tmpdir

* Simplify net log spec

Spawned Electron process on Linux CI can fail to launch

* Separate netLog module

* Remove net logging test from net spec

* Add tests for netLog

* Fix header guard

* Clean up code

* Add netLog.currentlyLoggingPath

* Callback with filepath

* Add test for case when only .stopLogging() is called

* Add docs

* Reintroduce error on invalid arg

* Update copyright

* Update error message

* Juggle file path string types

docs/README.md

@@ -129,6 +129,7 @@ These individual tutorials expand on topics discussed in the guide above.
 * [Menu](api/menu.md)
 * [MenuItem](api/menu-item.md)
 * [net](api/net.md)
+* [netLog](api/netLog.md)
 * [powerMonitor](api/power-monitor.md)
 * [powerSaveBlocker](api/power-save-blocker.md)
 * [protocol](api/protocol.md)