Update build workflow to use 'wp-scripts'

[divyarajmasani]

Summary

The wp-scripts has come a long way. Review the current build workflow and maybe update the npm scripts to use the scripts available in the 'wp-scripts' package.

The package comes with a few handy configurations for eslint and styling as well.

References

Acceptance Criteria

[Rajinsharwar]

Updated the package.json to use the wp-scripts commands instead of npm where applicable.