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

spec/api-net-spec.js

@@ -1524,7 +1524,7 @@ describe('net module', () => {
     })
   })
 
-  describe('Stability and performance', (done) => {
+  describe('Stability and performance', () => {
     it('should free unreferenced, never-started request objects without crash', (done) => {
       const requestUrl = '/requestUrl'
       ipcRenderer.once('api-net-spec-done', () => {