Added typescript to etherpad

* Fixed determining file extension.

* Added ts-node

* Fixed backend tests.

* Fixed frontend test runs.

* Fixed tests.

* Use script approach for starting etherpad.

* Change directory to src.

* Fixed env.

* Change directory

* Fixed build arg.

* Fixed docker build.

* Fixed.

* Fixed cypress file path.

* Fixed.

* Use latest node container.

* Fixed windows workflow.

* Use tsx and optimized docker image.

* Added workflow for type checks.

* Fixed.

* Added tsconfig.

* Converted more files to typescript.

* Removed commented keys.

* Typed caching middleware.

* Added script for checking the types.

* Moved SecretRotator to typescript.

* Fixed npm installation and moved to types folder.

* Use better scripts for watching typescript changes.

* Update windows.yml

* Fixed order of npm installation.

* Converted i18n.

* Added more types.

* Added more types.

* Fixed import.

* Fixed tests.

* Fixed tests.

* Fixed type checking test.

* Fixed stats

* Added express types.

* fixed.

.github/workflows/windows.yml

@@ -113,14 +113,16 @@ jobs:
           cache-dependency-path: |
             etherpad/src/package-lock.json
             etherpad/src/bin/doc/package-lock.json
+      - name: Install npm@6
+        run: npm install npm@6 -g
       -
         name: Install Cypress
-        run: cd etherpad && cd src && npm install cypress --legacy-peer-deps
+        run: cd etherpad && npm install cypress --legacy-peer-deps
       -
         name: Run Etherpad
         run: |
           cd etherpad
-          node node_modules\ep_etherpad-lite\node\server.js &
+          npm run prod --prefix ./src
           curl --connect-timeout 10 --max-time 20 --retry 5 --retry-delay 10 --retry-max-time 60 --retry-connrefused http://127.0.0.1:9001/p/test
           src\node_modules\cypress\bin\cypress run --config-file src\tests\frontendcypress\cypress.config.js
       # On release, upload windows zip to GitHub release tab