[patch][bug] fix source map load issue

[arunvishnun]

This PR includes changes to,

• Fix source-map load warning.

  

  By default we are setting webpack configuration devtool: false. Looks like a recent change and we get above source-map load warning if you have dev tools open. This was causing the app to stop responding when you have dev tools open. So passing down the inline-source-map configuration through xrun-taslks's webpack configuration.

• Setting a fallback devtool configuration to eval-cheap-module-source-map in @xarc/webpack

• Change clap references to xrun for poc-subapp, poc-subapp-redux and subapp1-online-store.

• Remove bluebird usage, instead use native promise in sample apps - poc-subapp, poc-subapp-redux and subapp1-online-store. Bluebird is only need to support old browsers or EOL Node.js. Removing its reference from these sample applications as its better to reference latest usage guidelines on sample applications.

Pending issues to resolve

• poc-subapp throws Error: Shared module is not available for eager consumption

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