feat(electron): move experimental Electron API to a separate package

Extract the experimental Electron automation API out of playwright-core
into a new @playwright/experimental-electron package. The new package is
a pure client built on top of chromium.connectToWorker (Node side) and
chromium.connectOverCDP (Chromium side), so playwright-core no longer
ships any Electron-specific client/server/dispatcher/protocol code.

A few legacy launch options (recordHar, recordVideo, tracesDir,
bypassCSP, artifactsDir) cannot be wired through the public surface
today; they are documented in packages/playwright-electron/features.md
together with the supported workarounds (page.screencast.start,
context.tracing.startHar, etc.).

Author: dgozman

docs/src/api/class-electron.md docs/src/electron-api/class-electron.mddocs/src/api/class-electron.md renamed to docs/src/electron-api/class-electron.md

@@ -2,16 +2,17 @@
 * since: v1.9
 * langs: js
 
-Playwright has **experimental** support for Electron automation. You can access electron namespace via:
+Playwright has **experimental** support for Electron automation, shipped as a
+separate package:
 
-```js
-const { _electron } = require('playwright');
+```sh
+npm i -D @playwright/experimental-electron
 ```
 
 An example of the Electron automation script would be:
 
 ```js
-const { _electron: electron } = require('playwright');
+import { electron } from '@playwright/experimental-electron';
 
 (async () => {
   // Launch Electron app.
@@ -89,59 +90,5 @@ Specifies environment variables that will be visible to Electron. Defaults to `p
 
 Maximum time in milliseconds to wait for the application to start. Defaults to `30000` (30 seconds). Pass `0` to disable timeout.
 
-### option: Electron.launch.acceptdownloads = %%-context-option-acceptdownloads-%%
-* since: v1.12
-
-### option: Electron.launch.bypassCSP = %%-context-option-bypasscsp-%%
-* since: v1.12
-
-### option: Electron.launch.colorScheme = %%-context-option-colorscheme-%%
-* since: v1.12
-
-### option: Electron.launch.extraHTTPHeaders = %%-context-option-extrahttpheaders-%%
-* since: v1.12
-
-### option: Electron.launch.geolocation = %%-context-option-geolocation-%%
-* since: v1.12
-
-### option: Electron.launch.httpcredentials = %%-context-option-httpcredentials-%%
-* since: v1.12
-
-### option: Electron.launch.ignoreHTTPSErrors = %%-context-option-ignorehttpserrors-%%
-* since: v1.12
-
-### option: Electron.launch.locale = %%-context-option-locale-%%
-* since: v1.12
-
-### option: Electron.launch.offline = %%-context-option-offline-%%
-* since: v1.12
-
-### option: Electron.launch.recordhar = %%-context-option-recordhar-%%
-* since: v1.12
-
-### option: Electron.launch.recordharpath = %%-context-option-recordhar-path-%%
-* since: v1.12
-
-### option: Electron.launch.recordHarOmitContent = %%-context-option-recordhar-omit-content-%%
-* since: v1.12
-
-### option: Electron.launch.recordvideo = %%-context-option-recordvideo-%%
-* since: v1.12
-
-### option: Electron.launch.recordvideodir = %%-context-option-recordvideo-dir-%%
-* since: v1.12
-
-### option: Electron.launch.recordvideosize = %%-context-option-recordvideo-size-%%
-* since: v1.12
-
-### option: Electron.launch.timezoneId = %%-context-option-timezoneid-%%
-* since: v1.12
-
-### option: Electron.launch.tracesDir = %%-browser-option-tracesdir-%%
-* since: v1.36
-
-### option: Electron.launch.artifactsDir = %%-browser-option-artifactsdir-%%
-* since: v1.59
-
 ### option: Electron.launch.chromiumSandbox = %%-browser-option-chromiumsandbox-%%
 * since: v1.59

docs/src/api/class-electronapplication.md …lectron-api/class-electronapplication.mddocs/src/api/class-electronapplication.md renamed to docs/src/electron-api/class-electronapplication.md docs/src/api/class-electronapplication.md renamed to docs/src/electron-api/class-electronapplication.md

@@ -71,7 +71,6 @@ export const methodMetainfo = new Map<string, MethodMetainfo>([
   ['Worker.waitForEventInfo', { title: 'Wait for event "{info.event}"', snapshot: true, }],
   ['WebSocket.waitForEventInfo', { title: 'Wait for event "{info.event}"', snapshot: true, }],
   ['Debugger.waitForEventInfo', { title: 'Wait for event "{info.event}"', snapshot: true, }],
-  ['ElectronApplication.waitForEventInfo', { title: 'Wait for event "{info.event}"', snapshot: true, }],
   ['AndroidDevice.waitForEventInfo', { title: 'Wait for event "{info.event}"', snapshot: true, }],
   ['BrowserContext.addCookies', { title: 'Add cookies', group: 'configuration', }],
   ['BrowserContext.addInitScript', { title: 'Add init script', group: 'configuration', }],
@@ -304,11 +303,6 @@ export const methodMetainfo = new Map<string, MethodMetainfo>([
   ['WritableStream.close', { internal: true, }],
   ['CDPSession.send', { title: 'Send CDP command', group: 'configuration', }],
   ['CDPSession.detach', { title: 'Detach CDP session', group: 'configuration', }],
-  ['Electron.launch', { title: 'Launch electron', }],
-  ['ElectronApplication.browserWindow', { internal: true, }],
-  ['ElectronApplication.evaluateExpression', { title: 'Evaluate', }],
-  ['ElectronApplication.evaluateExpressionHandle', { title: 'Evaluate', }],
-  ['ElectronApplication.updateSubscription', { internal: true, }],
   ['Android.devices', { internal: true, }],
   ['AndroidSocket.write', { internal: true, }],
   ['AndroidSocket.close', { internal: true, }],