[chore] Apply context isolation and rearrange execution.ts

[kyungeunni]

base work for

• Add more unit tests #264
• [Other] Add tests to onTest electron code #235

Summary

Currently, all the functions running in the main process were mangled together in the electron/execute.ts file. This makes it quite difficult to understand, hard to maintain, and a blocker for adding tests.

This PR tries to extract each function to its own file so that we could avoid the difficulties mentioned above, and make it possible to add unit tests.

Another important thing is that this PR introduces context isolation as per the security guideline provided by Electron.

Implementation details

• Turn off node integrations and enable context isolation
• functions in execution.ts is now divided into files under api/ directory
• the whole ipc is no longer exposed in CommunicationContext, now limited set of window.electronAPI is exposed

How to validate this change

run test, run dev

Note to reviewers:
I'm afraid this PR is quite big to go through, I wish I could break it down into smaller chunks of PRs but it was inevitable to do it all at once as everything was connected. I recommend seeing how the communication between renderer process <-> main process has been changed by exposing selected APIs in electron/preload.ts to align with the best practices.
Also, there are new components like browserManger or syntheticsManager. Those are introduced as it requires a somewhat shared state between functions as well as to make it easier for us to mock the dependency when testing. That being said, it might be an intermediate change that is subject to change in upcoming tests PRs.

[apmmachine]

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• Start Time: 2023-02-09T04:27:52.657+0000

• Duration: 3 min 52 sec

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[justinkambic]

Had a few slight improvements/asks and some nit comments.

Really fantastic work on this!

[justinkambic]

LGTM!