Chore: Add electron test

[nytamin]

This PR adds a test for ensuring that threadedclass works inside of packed electron apps.

The test is based on Hannes Rügers repo https://github.com/hrueger/threadedclass-issue-74, thanks!

[nytamin]

Running the test with the latest threadedclass version (1.2.0) renders the result:

./electron-tests>node run-tests.js
=========================================
Running test with threadedClass version "1.2.0" and electron version "15"
Starting tests...
yarn install
yarn test:vanilla
   stderr: Signal "exit" event, exit code: 0
yarn test:electron
   stderr: Signal "exit" event, exit code: 0
yarn electron-compile
yarn test:electron-compiled
   stderr: Signal "exit" event, exit code: 0
=========================================
Running test with threadedClass version "1.2.0" and electron version "17"
Starting tests...
yarn install
yarn test:vanilla
   stderr: Signal "exit" event, exit code: 0
yarn test:electron
   stderr: Signal "exit" event, exit code: 0
yarn electron-compile
yarn test:electron-compiled
   stderr: Timeout after 2000, context: "set up threadedclass"
   stderr: Signal "exit" event, exit code: 1
=========================================
Running test with threadedClass version "1.2.0" and electron version "20"
Starting tests...
yarn install
yarn test:vanilla
   stderr: Signal "exit" event, exit code: 0
yarn test:electron
   stderr: Signal "exit" event, exit code: 0
yarn electron-compile
yarn test:electron-compiled
   stderr: Timeout after 2000, context: "set up threadedclass"
   stderr: Signal "exit" event, exit code: 1
=========================================
Running test with threadedClass version "1.2.0" and electron version "22"
Starting tests...
yarn install
yarn test:vanilla
   stderr: Signal "exit" event, exit code: 0
yarn test:electron
   stderr: Signal "exit" event, exit code: 0
yarn electron-compile
yarn test:electron-compiled
   stderr: Timeout after 2000, context: "set up threadedclass"
   stderr: Signal "exit" event, exit code: 1
Done successfully!

...highlighting the issues with electron 17, 20 & 22.

Running the test with the version of threadedclass with the fix in PR #75 renders this result:

./electron-tests>node run-tests.js 1.2.1-nightly--20221205-135702-1e063a1.0
=========================================
Running test with threadedClass version "1.2.1-nightly--20221205-135702-1e063a1.0" and electron version "15"
Starting tests...
yarn install
yarn test:vanilla
   stderr: Signal "exit" event, exit code: 0
yarn test:electron
   stderr: Signal "exit" event, exit code: 0
yarn electron-compile
yarn test:electron-compiled
   stderr: Signal "exit" event, exit code: 0
=========================================
Running test with threadedClass version "1.2.1-nightly--20221205-135702-1e063a1.0" and electron version "17"
Starting tests...
yarn install
yarn test:vanilla
   stderr: Signal "exit" event, exit code: 0
yarn test:electron
   stderr: Signal "exit" event, exit code: 0
yarn electron-compile
yarn test:electron-compiled
   stderr: Signal "exit" event, exit code: 0
=========================================
Running test with threadedClass version "1.2.1-nightly--20221205-135702-1e063a1.0" and electron version "20"
Starting tests...
yarn install
yarn test:vanilla
   stderr: Signal "exit" event, exit code: 0
yarn test:electron
   stderr: Signal "exit" event, exit code: 0
yarn electron-compile
yarn test:electron-compiled
   stderr: Signal "exit" event, exit code: 0
=========================================
Running test with threadedClass version "1.2.1-nightly--20221205-135702-1e063a1.0" and electron version "22"
Starting tests...
yarn install
yarn test:vanilla
   stderr: Signal "exit" event, exit code: 0
yarn test:electron
   stderr: Signal "exit" event, exit code: 0
yarn electron-compile
yarn test:electron-compiled
   stderr: Signal "exit" event, exit code: 0
Done successfully!