Upgrade Asset Modules

[PiyushChandra17]

Fixes #2023

Changes:

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #123

[raclim]

Thanks for your work on this! Since there's currently an open PR (#2957) for this issue at the moment, I think we might stick with that one to resolve it. I'm sorry that we couldn't get this one in, but will check out the other ones you've raised!

[PiyushChandra17]

@raclim I think this PR is up to date one with context with the latest webpack version, also i have gone through the webpack docs here.

Made the following changes:

• npm installed latest webpack version
• npm uninstalled file-loader, raw-loader
• replaced file-loader with asset/resource
• replaced raw-loader with asset/source
• added generator following the docs
• Used hash version in production, i think that's what the docs states

PS: If this goes well, i can reopen this PR in future i guess else we can stick the existing one