Make IPC debug tracing configurable

[alvsan09]

This change associates IPC tracing with the logger.debug method,
therefore enabling debugging enables IPC tracing.

Additionally, two new scripts are added to the top package.json, which can
be called as follows:

yarn debug:electron
yarn debug:browser

these enable starting of the electron and browser application examples in
debug mode.

Signed-off-by: Alvaro Sanchez-Leon [email protected]

What it does

Adds two new scripts to start the example applications (electron and browser) in debug mode,
it additionally associates IPC traces to debug mode.

How to test

1. Start the electron application in debug mode and verify that debug traces are present

yarn debug:electron

2. Modify a file present in the workspace and check that IPC traces are displayed e.g.
   
3. close the theia example application
4. Start the electron application (no debugging mode), repeat step 2. and make sure no debug traces appear.

yarn start:electron

Repeat the steps above replacing the yarn electron scripts for the corresponding browser scripts
i.e.

yarn debug:browser
yarn start:browser

Review checklist

• as an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• as a reviewer, I agree to behave in accordance with the review guidelines

[vince-fugnitto]

I confirmed that the tracing works at the ipc level (filesystem and git) with the changes.

• yarn start:electron: no debug logs present.
• yarn debug:electron: debug logs are present on the backend.
• yarn start:browser: no debug logs present.
• yarn debug:browser: debug logs are present on the backend.

An example log is the following:

root DEBUG [git-locator: 11545] Sending request 'locate - (0)'. Params: [
    "/Users/vincentfugnitto/workspace/theia",
    {}
]

I'll let others review as well to see if they have any feedback.