Clean up code to have consistent formatting

[crisner]

Fixes #301 (<=== Add issue number here)

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[newbazz]

There are 26 files that have been changed,, somethings wrong please have a look into it.

[crisner]

Thank you for pointing it out @newbazz! It shows 26 files because it includes all layer and util js files and the ESLint config files. The clean up was done in all 22 of js files. I do not know if it is recommended to clean up all files at once though. :)

[crisner]

@sagarpreet-chadha, would like your feedback on this. Changes in this PR include setting up ESLint and cleaning up files to have consistent formatting. Thanks!

[newbazz]

@crisner the pr should be atomic, can you please have 2 separate prs for 2 issues.

[sagarpreet-chadha]

This has been in my to-do checklist from a very long time. Thank you so much!!!

[jywarren]

This is great. @crisner @sagarpreet-chadha is this good to merge? Thanks!!