Migrate to eslint

[raajnadar]

Reason for PR

palantir/tslint#4534

What did I do?

• Added eslint and prettier config.
• Fixed lint issues.
• Added npm script to run lint test with CI.

While setting up I found few typescript warning which we need to fix.

[abhinavdalal-iconnect]

looks good to me!

[raajnadar]

@YIZHUANG please review this pr.. This pr will make the development more easier once this is merge I will send another pr for vscode and editor config.

We can configure preetier according to our needs initially the project used double quotes but I changed to single.

[raajnadar]

I suppressed all the warnings which we can fix in future updates most of they are due to the usage of any keyword in typings.

We are left with 2 errors which I tried to fix but have no idea how to fix it.

[YIZHUANG]

Thank you for the PR.
The "eslint src/**/*{.js,.jsx,.ts,.tsx}" doesn't run and husky is lacking. Otherwise looks good.

[raajnadar]

I went through the package.json and found that husky is not configured I will create a separate PR with husky pre-commit hook and all the necessary commands.

I think we should not make this PR more complicated..!