Adding browser support polyfill

[skqksh]

Is your request related to a problem? Please describe.
web3/web3.js@fce653d

Describe the solution you'd like
do not need to set additional webpack config like this
https://stackoverflow.com/a/67814031

Describe alternatives you've considered
maybe setting 'browser' config in package.json

Additional context
I tried like this on the root package.json file and published it, but it doesn't work
"browser": "dist/caver.min.js",