Add EventManager implementation for handling events from WebView and IDE

[kerenr-jfrog]

• All tests passed. If this feature is not already covered by the tests, I added new tests.

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• Added EventManager to handle events between the WebView and the IDE.
• Added a Sender for pushing events to the WebView.
• Added a Receiver for getting events from the WebView - need to add handling logic for each event.

[hadarshjfrog]

Overall lgtm.
Mostly code cleaning issues.
But how can we test functionality here? even if it's complex - try to add just a one test for the browser - so we'll have some sanity - we can enrich it later.

[github-actions]

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