Fix: Performance issues in chrome PSAT extension.

[amovar18]

Description

In dailymail.co.uk it was seen that the PSAT extension consumed more amount of CPU when extension was opened. This is an effort to reduce the CPU consumption being done by PSAT UI.

Relevant Technical Choices

• Only change state if any value in cookie has changed.
• Use deep object diff to calculate diff between objects.
• Use chrome.webNavigation.onCompleted listener instead of chrome.tabs.onUpdated

Testing Instructions

Additional Information:

Screenshot/Screencast

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Checklist

• I have thoroughly tested this code to the best of my abilities.
• I have reviewed the code myself before requesting a review.
• [ ] This code is covered by unit tests to verify that it works as intended.
• The QA of this PR is done by a member of the QA team (to be checked by QA).